Early Arrival of Humans in China Surprises Researchers by Thousands of Years

The first members of our species to reach China may have entered this region from the north

Esteban de Armas / Alamy

Modern humans lived in what is now China by 45,000 years ago. This discovery means our species arrived in this region thousands of years earlier than commonly thought, probably via a northern route through present-day Siberia and Mongolia.

A team co-led by Francesco d'Errico Researchers from the University of Bordeaux in France reexamined an archaeological site in northern China called Shiyu. Originally, he was excavated in 1963 during the turbulent period of China's Cultural Revolution. “It couldn't have been a better time to find such an important site,” D'Errico says.

Shiyu is an outdoor site located in a river gorge. There, 30 meters deep, sand and other sediments were deposited, which the first excavators divided into four horizontal layers, from the bottom of which the second layer contained human It was found that there was evidence of residence in

Excavators discovered more than 15,000 stone artifacts and thousands of animal bones. There was also part of a hominin skull, which anthropologist Wu Lukang identified as a modern human.homo sapiens).

Some of the artifacts were later transferred to the Institute of Vertebrate Paleontology and Paleoanthropology in Beijing. However, those left behind at the local facility were lost, including the hominin bones. “We own maybe 10 percent of the stone tools,” D'Errico says.

D'Errico and his colleagues re-excavated Shiyu to determine its age. They dated 15 sediment samples using a technique called photostimulated luminescence and carbon-dated 10 animal bones and teeth. The hominid layer is approximately 44,600 years old.

D'Errico believes the excavator was “knowledgeable” and correctly identified the skull.

The Shuyu tribe is probably homo sapienssay Alina Katzenovic from the Institute of Archeology and Ethnology in Novosibirsk, Russia, was not involved in the study.

The new study therefore suggests that modern humans arrived in northern China about 45,000 years ago. This would postpone the arrival of our species to China by about 5,000 years.Derico claims to be the next oldest homo sapiens China's site Tengen Cave 40,000 years ago.

Some researchers argue that our species may have arrived earlier than that, up to 260,000 years ago. However, D'Errico points out that researchers: criticized much of the evidence As for the presence of such early humans in this region.

Humans probably entered Asia from Africa and spread through multiple routes, Katzenovich said. They not only explored the tropical southern regions of Asia, but also headed further north. Katzenovich says there are signs of modern human presence in the area. Obi Rakhmat Cave Uzbekistan 48,800 years ago. Perhaps our species reached Shiyu and then China via this route. north route.

When modern humans reached new areas, they encountered hominids that were already living there, such as Neanderthals and Denisovans further east. Genetic evidence shows that we interbred with them. There may also have been cultural exchanges, and the Shiyu artifacts also include what appear to be more ancient human tools.

There is also evidence of long-distance contact. The Shiyu team identified four fragments of obsidian, a volcanic glass. They were able to track them as far as 800 and 1000 kilometers northeast of Shiyu. D'Errico said it was unlikely that the residents traveled this distance themselves, so they were probably part of the group's network. In line with this, Kazenovich said some of Shiyu's artifacts resemble items found as far east as Korea.

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Source: www.newscientist.com

Post Office Memo from 25 Years Ago Predicts Scandal: The Post Office Horizon Incident

I
In any major scandal that has the power to monopolize national attention, there are always key moments when events could have been stopped in their tracks. But few early warnings were as prescient as his seven-page memo handed to postal workers 25 years ago.

During an acrimonious meeting at Newcastle Rugby Club in 1999, the memo set out a number of concerns raised by postmasters in the north-east of England who were trialling the now infamous Horizon accounting system. It had been. Problems such as account balances caused stress for some people, forcing them to work late into the night.

Shortly after these concerns were raised, the subpostmasters met again to discuss the potential severity of the problem.
“The hardship and trauma that some postmasters are experiencing has raised concerns about their health and mental well-being,” the meeting was informed.

“Some felt that unless something changed soon, tragedy was not far away. The software was of poor quality and was not intended to run such a large network. Ta.”

Warnings of potential tragedy come as the flawed software – later found to have the potential to cause false losses that were blamed on postal workers – is rolled out across the Post Office network. done before.

But from the moment of the fateful decision to press forward with this destiny, a disastrous combination of legal change, geopolitics, a catastrophic lack of political curiosity, and above all outright deception, ultimately led to Thousands of innocent workers were victimized and prosecuted, with devastating effects.

At least four people took their own lives this week, the week in which Westminster finally acknowledged that unprecedented mass exonerations were needed to right more than two decades of injustice. Sadly, it was too late for the dozens of postmasters who were wronged and died, including one who died.




Former Posts Minister Paul Scally announced an independent inquiry into the Horizon scandal in 2020. Photo: Bloomberg/Getty Images

Source: www.theguardian.com

Microsoft Surpasses Apple to Reclaim Title of Most Valuable Company after Two Years

Microsoft's stock closed above Apple's for the first time since 2021 on Friday, making it the world's most valuable company, as demand concerns hit the iPhone maker's stock price.

On Friday, Apple rose 0.2% and Microsoft rose 1%. This brings Microsoft's market capitalization to $2.887 trillion, an all-time high, according to LSEG data. Apple's market capitalization, calculated based on Thursday's filing data, was $2.875 trillion.

Concerns about smartphone demand have pushed Apple stock down 3% so far in 2024 after rising 48% last year. Microsoft is up about 3% since the beginning of the year after soaring 57% in 2023 on a bull run driven in part by its lead in generative artificial intelligence through its investment in ChatGPT maker OpenAI.

According to LSEG, Apple's market capitalization peaked at $3.081 trillion on December 14th.

Microsoft is incorporating OpenAI's technology into its suite of productivity software, which helped fuel a recovery in its cloud computing business in the July-September quarter. His AI leadership at the company has also created an opportunity to challenge Google's dominance in web search.

Meanwhile, Apple is grappling with sluggish demand, including for its cash cow iPhone. Demand in China, a major market, is sluggish as the Chinese economy has been slow to recover from the coronavirus pandemic and a revived Huawei is eating away at market share.

Sales of Apple's Vision Pro mixed reality headset will begin in the US on February 2nd, marking Apple's biggest product launch since the iPhone in 2007. However, UBS estimated in a report this week that Vision Pro sales are “relatively insignificant” to Apple. Earnings per share in 2024.

Since 2018, Microsoft briefly overtook Apple as the most valuable company, and most recently in 2021, when concerns about pandemic-related supply chain shortages affected the iPhone maker's stock price.

In its latest quarterly report in November, Apple gave a holiday quarter sales forecast that was lower than Wall Street's expectations due to weak demand for iPads and wearables.

Analysts on average expect Apple's December quarter sales to rise 0.7% to $117.9 billion, according to LSEG. As a result, sales will increase year-on-year for the first time in four quarters. Apple announced its financial results on February 1st.

Analysts expect Microsoft to report a 16% increase in revenue to $61.1 billion in the coming weeks due to continued growth in its cloud business.

Source: www.theguardian.com

New study suggests Gigantopithecus became extinct 215,000-295,000 years ago

Gigantopithecus brachyThe largest primate in history and one of the largest species of Southeast Asian megafauna, it lived in China from about 2 million years until its extinction during the Middle Pleistocene. New research shows that starting 2.3 million years ago, this environment was a mosaic of forests and grasses, providing ideal conditions to thrive. Gigantopithecus brachy population. However, from 295,000 years ago, just before and during the extinction period 215,000 years ago, increased seasonality led to increased environmental variability, changes in plant communities, and an increase in open forest environments. Although they are close relatives, Chinese orangutan (Pongo Weidenrach)managed to adapt their food preferences and behavior to this fluctuation. Gigantopithecus brachy There were signs of chronic stress and population decline. Ultimately, that struggle to adapt led to the extinction of the largest primate to ever live on Earth.

Impressions of a group of artists Gigantopithecus brachy In the forest of southern China. Image credit: Garcia / Joannes-Boyau, Southern Cross University.

Gigantopithecus brachy It is an extinct giant hominid that once lived in the jungles of Southeast Asia.

As the name suggests, this giant primate was larger than a gorilla, reaching up to 3 meters (10 feet) tall and weighing up to 540 kg (1,200 pounds).

“Our current understanding is that Gigantopithecus brachy “It originates from early to mid-Pleistocene cave deposits between the Yangtze River in southern China and the South China Sea,” said Professor Yingqi Zhang of the Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, and colleagues.

“This primate is known for its unusually large molars, abnormally thick enamel, estimated height of about 3 meters, and weight of 200 to 300 kg, making it the largest primate to have ever existed on Earth. I am.”

“Despite 85 years of exploration, Gigantopithecus blacki's fossil record is limited to four mandibles and nearly 2,000 isolated teeth, with no postcranial evidence. ”

“The initial discovery as a 'dragon's tooth' in a pharmacy in Hong Kong led to the search for the first in situ finds, which led to the discovery of several cave sites in two major regions of Chongzuo and Fuping basins in Guangxi province. This led to the discovery of

“These sites contain important evidence of its survival and eventual demise.”

“Providing a clear cause for a species' extinction is a major feat, but establishing the exact time a species disappeared from the fossil record provides a target time frame for environmental reconstruction and behavioral assessment.” said Macquarie University geochronologist Dr John Martin. Kira Westaway.

“Without reliable dating, you're simply looking for clues in the wrong places.”

To identify potential causes Gigantopithecus brachy In case of extinction, the researchers applied a regional approach to 22 caves in the Chongzuo and Bupyeong basins. Gigantopithecus brachy-Bearing or non-bearing-Gigantopithecus brachy-Contains cave deposits.

They combined previous excavations with recently discovered caves to identify and sample fossil breccias for dating, paleoclimate estimation, and behavioral analysis.

Six different dating techniques were applied to the cave deposits and fossils, yielding 157 radiometric dates.

Luminescence dating measures light-sensitive signals in buried sediments. Gigantopithecus brachy Fossils were the primary technology supported by uranium series and electron spin resonance dating. Gigantopithecus brachy The tooth itself.

“Direct dating of the fossil remains allowed us to confirm that their ages match the luminescence order of the deposits in which they were found, providing a comprehensive and reliable chronology of the human extinction. Gigantopithecus brachy'' said Dr Renaud-Joan Boyau, a geochronologist at Southern Cross University.

The findings show that Gigantopithecus brachy They went extinct between 295,000 and 215,000 years ago, much earlier than previously thought.

Before this time, Gigantopithecus brachy They thrived in rich and diverse forests.

By 700,000 to 600,000 years ago, the environment had further changed due to increased seasonal intensity, leading to changes in the structure of forest communities.

orangutans etc. Pongo Weidenrach They adapted their size, behavior, and habitat preferences in response to changing conditions.

In comparison, Gigantopithecus brachy When preferences were not available, they relied on backup food sources with low nutritional value, reducing dietary diversity.

The primates experienced reduced locomotion, reduced geographic foraging range, chronic stress and population decline.

Gigantopithecus brachy “It was the ultimate specialist compared to more agile adapters like orangutans, but this ultimately led to its demise,” Professor Chan said.

“With the threat of a sixth mass extinction looming over us, there is an urgent need to understand why species go extinct,” Dr Westaway said.

“Exploring the reasons for unresolved extinctions in the past is a good starting point for understanding the resilience of primates and the fate of other large animals in the past and future.”

of findings Published in today's diary Nature.

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Y. Chan other.The end of the giant ape Gigantopithecus brachy. Nature, published online on January 10, 2024. doi: 10.1038/s41586-023-06900-0

Source: www.sci.news

The Extinction of Gigantopithecus: An Exploration into Its Cause 295,000 Years Ago

Gigantopythos black probably lived in a “mosaic of forest and grass”

Garcia/Joanne Boyau (Southern Cross University)

The largest known primates went extinct between 295,000 and 215,000 years ago, probably because they were unable to adapt their food preferences to a changing climate.

A relative of modern orangutans, Gigantopithecus brachy Known as “Giganto”, it was 3 meters tall and weighed up to 300 kilograms.

Despite living for more than two million years, the species has been shrouded in mystery since 1935, when a fossilized tooth was discovered in a traditional medicine store in Hong Kong. The giant tooth was initially thought to belong to a dragon, but paleontologists soon discovered it. In fact, it turns out that it belongs to a primate.

“When I think of them, I think of the giants,” he says. Kira Westaway Graduated from Macquarie University, Sydney, Australia. “Usually when you think of giants, you think of dinosaurs, but this was a primate giant.”

To establish a timeline of when this ape became extinct, Westaway and her colleagues studied hundreds of teeth and four jawbone fragments found in caves throughout southern China's Guangxi province. By observing the radioactive decay of certain elements, such as uranium, in teeth and bones, researchers can determine how much time has passed since death.

They also examined other deposits in the cave, such as pollen and sediment, to determine its condition. G. Blackie – Herbivores – lived there.

“We show that starting 2.3 million years ago, the environment was a mosaic of forests and grasses, providing ideal conditions for flourishing. G. Blackie population,” the researchers wrote. “However, just before and during the extinction period between 295,000 and 215,000 years ago, increased seasonality led to increased environmental variability, which led to changes in plant communities and an increase in open forest environments. the researchers added.

By studying the stripes on fossilized animals' teeth, researchers discovered signs of chronic stress caused by lack of access to their favorite foods. They say the creature's failure to adapt to a changing climate and accompanying fluctuations in food likely sealed its fate. In contrast, orangutans, of which three species survive, have adapted their dietary preferences and behavior in response to increasing climate change.

“eventually [G.blacki’s] “The struggle to adapt led to the extinction of the largest primate to ever live on Earth,” the researchers wrote. They also dispelled the idea that hominins may have competed with or hunted the species, precipitating its extinction. “There's no evidence for this,” Westaway says.

julian lewis Researchers at Griffith University in Queensland, Australia say they present a convincing case that environmental change, particularly increased habitat variability, has likely had negative effects on organisms. . G. Blackie.

However, he added that the fossils studied came from a very limited geographical area.resembles a fossil G. Blackie It is also found in Thailand, Vietnam, and Indonesia.

“One thing seems almost certain: Their actual geographic range would have been much larger than current fossils indicate,” Ruiz says. “We don't know how much this will affect the timing of global extinction of this species.”

anne marie bacon Researchers at France's National Center for Scientific Research say this study can help us understand. Mr. G. Blackie But studying China's fossils only reveals part of its history.

“Although this paper focuses on records from China, we do not know whether the geographic range of great apes extended into Indochina because there are few paleontological remains in Asia.” [mainland South-East Asia]we also looked at what the southern limit of this range was,” she says.

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Source: www.newscientist.com

Possible Discovery of Dinosaur Bones in Africa Dates Back 1,000 Years

The credit for discovering the first dinosaur bones is usually given to an English gentleman who discovered them in England between the 17th and 19th centuries. British natural historian Robert Plott first described dinosaur bones in his 1676 book. Oxfordshire natural history. Paleontologists from the University of the Witwatersrand and Nelson Mandela University have presented evidence that the first dinosaur bones may have been discovered in Africa as much as 500 years before Plott's discovery.

tyrannosaurus rex. Image credit: Amanda Kelly.

Humans were born in Africa. homo sapiens It has existed for at least 300,000 years.

And this continent is home to a wide variety of rock outcrops, including the Kem Kem Formation in Morocco, the Fayum Depression in Egypt, the Rift Valley in eastern Africa, and the Karoo in southern Africa, which contain fossils that were always accessible to our ancestors. I am.

So it's not just that Africans were likely the first to discover fossils. It was inevitable.

In many cases, the first dinosaur fossils claimed to have been discovered by scientists were actually brought to our attention by local guides.

An example is the discovery of giant dinosaurs. jobaria By the Tuareg people of Niger Giraffatitan By the Mwera people of Tanzania.

our paperPublished in Geological Society, London, Special Publicationreviews what is known about African indigenous fossil knowledge.

We enumerate fossils that may have been known since ancient times at various sites in Africa and discuss how they were used and interpreted by African communities before the science of paleontology was born. .

Massospondylus carinatus. Image credit: Nobu Tamura, http://spinops.blogspot.com / Patty Jansen / Sci.News.

Borara Rock Shelter in Lesotho

One of the highlights of our paper is the ruins of Borara, a Late Stone Age rock shelter in Lesotho.

Various dating techniques indicate that the site was inhabited by the Khesan and Basotho peoples from the 12th to 18th centuries (1100-1700 AD).

The shelter itself is surrounded by hills formed by compacted sediments deposited under harsh deserts like the Sahara some 180 to 200 million years ago, when the first dinosaurs roamed the Earth. Masu.

This region of Lesotho is particularly well known for its deliveries. Massospondylus carinatusa dinosaur with a body length of 4 to 6 meters, a small head and a long neck.

Fossilized bones of this kind are abundant in this area and were already the case when this place was occupied by people in the Middle Ages.

In 1990, archaeologists working in Bolarla discovered a human finger bone. Massospondylus He was being carried into a cave.

There are no fossilized skeletons protruding from the cave walls. So the only possibility that this phalanx ended up there is that someone picked it up in the distant past and carried it to a cave.

Perhaps this person did it out of simple curiosity, or to turn it into a pendant or toy, or to use it in a traditional healing ritual.

After heavy rains, it is not uncommon for people in the area to discover bones of extinct species that have been washed away from the host rock.

They usually recognize them as belonging to dragon-like monsters that swallow humans and even entire houses.

In Lesotho, the Basotho people call the monster “Holmormo,'' and in the Eastern Cape, which borders South Africa, the Xhosa people call it “Amagongonko.''

The exact date on which the phalanx was collected and transported has unfortunately been lost to time.

Given current knowledge, the period of occupation of the shelter could be between the 12th and 18th centuries.

This leaves open the possibility that the dinosaur bones were collected up to 500 years before Plott's discovery.

Early knowledge about extinct organisms

Most people have known about fossils long before the age of science, as far back as society's collective memory can go.

For example, in Algeria, people referred to some dinosaur footprints as belonging to the legendary “rock bird”.

In North America, cave paintings depicting dinosaur footprints were painted by the Anasazi people between 1000 and 1200 AD.

Indigenous Australians have identified dinosaur footprints as those of the legendary 'Emuman'.

In the south, the infamous conquistador Hernán Cortés was gifted a fossil mastodon femur by the Aztecs in 1519.

In Asia, Hindus have worshiped ammonites (coiled fossil shells), which they call “shaligrams,” for more than 2,000 years.

Claim credit

The fact that African people have known about fossils since ancient times is clear from folklore and the archaeological record, but there is still much to learn about them.

For example, unlike peoples in Europe, the Americas, and Asia, indigenous African paleontologists appear to have little use of fossils in traditional medicine.

We do not yet know whether this is a truly unique cultural feature common to most African cultures, or whether it is due to our admittedly still incomplete knowledge.

Also, some fairly prominent fossil sites, such as Morocco's Kem Kem Formation and South Africa's UNESCO World Heritage Cradle of Man caves, do not yet provide solid evidence of indigenous knowledge.

This is unfortunate, as fossil-related traditions can help bridge the gap between local communities and paleontologists, thereby contributing to the preservation of important heritage sites.

By investigating the paleontology of Africa's indigenous peoples, our team brings together the pieces of a forgotten past and serves local communities.

We hope this will inspire a new generation of local paleoscientists to follow in the footsteps of Africa's first fossil hunters.

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julian benoit other. 2024. Paleontological knowledge of African indigenous peoples. Geological Society, London, Special Publication 543; doi: 10.1144/SP543-2022-236

author: julian benoita paleontologist at the University of the Witwatersrand.

cameron penn clarka paleontologist at the University of the Witwatersrand.

charles helma paleontologist at Nelson Mandela University.

This article was first published conversation.

Source: www.sci.news

Ancient sponge fossil unearthed in Ireland by paleontologists dating back 315 million years

Remarkable new species over 50 cm (20 inches) tall Chiatophicus varori is the largest known member of its genus theatophicus and one of the largest sponges in the order mesh.

Chiatophicus varori. Image credit: Botting other., doi: 10.1016/j.geobios.2023.07.004.

theatophicus “This is one of the most widely distributed Ordovician and Silurian sponge genera, recorded throughout the Iapetus region and tentatively in Bohemia,” said lead authors Ballen and Moher. said Dr Eamon Doyle, geologist at the Cliffs UNESCO Global Geopark, and colleagues. .

“This genus was widely distributed in offshore marine environments from the Middle Ordovician to the Middle Devonian, but has not previously been recorded in rocks from that period.”

named Chiatophicus varorithe newly identified species lived during the Carboniferous period, about 315 million years ago.

When alive, the vase-shaped sponge had a circular opening at the top surrounded by a ring of eyelash-like structures.

Probably similar to modern times Venus flower basket spongefound in the Pacific Ocean and often featured in deep-sea wildlife documentaries.

“This is a very large example of a type of fossil sponge that was previously only known from much older rocks elsewhere in the world,” Dr Doyle said.

“This is the first record of a sponge fossil of this type found in Ireland and its excellent state of preservation is extremely rare.”

specimen of Chiatophicus varori collected from Kilkee Cyclosem, Central Clare Group, Namuria, County Clare,Ireland.

“Sponges originally consisted of a rectangular network of tiny needles made of silica, held together by a thin organic membrane,” Dr Doyle said.

“Normally they fall apart quickly after death, and often only scattered remains of the needles are preserved as fossils, so we were delighted to find these nearly intact specimens. .”

“This wonderfully preserved fossil dates back to a time when the Atlantic Ocean had not yet begun to form, and the area now known as County Clare was part of an early ocean located near the equator.”

“Discoveries like this help raise awareness of the amazing geological heritage we have here on our doorstep in County Clare, and inspire a new generation of palaeontologists – geologists who specialize in the study of fossils. will help encourage people to visit and learn more about the unique geology of Ireland's west coast. ”

“We were surprised by the size and well-preserved condition of this fossil. This was completely unexpected,” said lead author Dr. Joseph Botting, a researcher at Amgefa Shimul Museum in Wales and the Nanjing Institute of Geology and Paleontology. said.

“This discovery provides important insight into the evolution of sponges and how some species are able to survive in niche environments where most other species cannot live. It is unusual for a specimen to be found.”

“This is a fantastic discovery and a reminder that new and interesting fossils are still being discovered that help us understand the story of life on Earth,” said the co-authors, from the Amgefa Cymru Museum in Wales. said Dr. Lucy Muir, a researcher at . .

team's paper Published in Journal October 2023 issue geobios.

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Joseph P. Botting other. 2023. A late surviving extra-large reticulated sponge from the Carboniferous of Ireland. geobios 80: 1-13; doi: 10.1016/j.geobios.2023.07.004

Source: www.sci.news

A ‘Giant’ Predator Roamed the Waters of Greenland 518 Million Years Ago

It has fins on the sides of its body, a unique head with long antennae, a huge jaw structure in its mouth, and can grow to over 30 cm (11.8 inches) in length. Timole Bestia Copley It was one of the largest animals in the ocean during the early Cambrian period.

reconstruction of Timole Bestia Copley Among the pelagic ecosystems preserved in Sirius Passet. Other species shown in the foreground are key salt kia, silicalis, Kerygmacella, Paulo end point, Kleptosurand Isoxis; There are also two radioactive substances in the background. Tamisiocharis And Unplected Belid. Image credit: Robert Nicholls/BobNichollsArt.

Timole Bestia Copley They lived in the early Cambrian oceans over 518 million years ago.

The fossilized remains of this animal were discovered in Fossil locality of Sirius Passet in northern Greenland.

“We previously knew that the main predators of the Cambrian were primitive arthropods, including the bizarre-looking anomalocariids,” said Dr Jacob Binther, a palaeontologist at the University of Bristol.

“but, Timole Bestia Copley is a distant but close relative of a living caterpillar; or Chetognath. These are much smaller marine predators today, feeding on small zooplankton. ”

“Our study shows that these ancient marine ecosystems were fairly complex and had food chains that tolerated multiple layers of predators.”

Timole Bestia They were the giants of their time and would have been near the top of the food chain. As such, they are as important as major carnivores in the modern ocean, such as Cambrian sharks and seals. ”

Inside a fossilized digestive system Timole Bestia CopleyDr. Vinther et al. Isoxis.

“We can see that these arthropods were a food source for many other animals,” says palaeontologist Dr Morten Lunde Nielsen of the Korean Polar Research Institute, the University of Bristol and the British Geological Survey.

“They were very common in Sirius Passet and had long protective spines pointing both forward and backward.”

“But it is clear that they could not completely avoid that fate. Timole Bestia I munched on them in large quantities. ”

holotype of Timole Bestia Copley.Image credit: Park other., doi: 10.1126/sciadv.adi6678.

“Arrowworms are one of the oldest animal fossils from the Cambrian period. Arthropods appear in the fossil record about 521 to 529 million years ago, but arrowworms appear in the fossil record at least 500 million years ago. It can be traced back to 38 million years ago,” Dr. Vinter said.

“Both arrowworms and more primitive arrowworms, Timole Bestia, was a swimming predator. Therefore, we can infer that they were likely predators that dominated the oceans before arthropods took off. ”

“They probably had a dynasty for about 10 to 15 million years before being replaced by other more successful groups.”

Timole Bestia “This is a hugely important discovery for understanding where these jawed predators came from,” said Dr Luke Parry from the University of Oxford.

“Today, the caterpillar has formidable setae on the outside of its head to catch prey, but Timole Bestia There is a jaw in the head. ”

“This is the bearded bug that we can see under a microscope today, and it is an organism that shared an ancestor with the bearded bug more than 500 million years ago.”

Timole Bestia And other fossils like it provide a link between closely related organisms that look very different today. ”

“Our discovery confirms how the beetles evolved,” said Dr. Taeyoon Park, a paleontologist at the Korea Polar Research Institute.

“The abdomen of living arrowworms has a unique nerve center called the ventral ganglion. It is completely unique to these animals.”

“I found this saved. Timole Bestia and another fossil called Amiskwia

“People are, Amiskwia As part of the evolutionary stem lineage, it was closely related to the caterpillar. ”

“The preservation of these unique ventral ganglia gives us even more confidence in this hypothesis.”

team's work It was published in the magazine scientific progress.

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Taeyoon S. Park other. 2024. Chaetognus in the giant stem group. scientific progress 10(1); doi: 10.1126/sciadv.adi6678

Source: www.sci.news

Ancient microfossils indicate photosynthesis originated 1.75 billion years ago

Oldest known evidence of photosynthetic structures identified in a collection of mysterious cylindrical microfossils Nabyfusa magensis It was discovered in the 1.75 billion year old McDermott Formation in Australia.



Nabyfusa magensis Microfossil: (a) Nabyfusa magensis From the McDermott Formation of the Tawala Supergroup, northern Australia. (b) Nabyfusa magensis From the Grassy Bay Formation of the Shaler Supergroup in the Canadian Arctic. (c) Nabyfusa magensis From the Mbujimai supergroup BIIc6 formation in the Democratic Republic of the Congo. Scale bar – 50 μm. Image credit: Demoulin other., doi: 10.1038/s41586-023-06896-7.

Oxygenic photosynthesis, in which sunlight catalyzes the conversion of water and carbon dioxide to glucose and oxygen, is unique to cyanobacteria and related organelles within eukaryotes.

Cyanobacteria played an important role in the evolution of early life and were active before the B.C. big oxidation event Approximately 2.4 billion years ago, the timing of the origin of oxygenic photosynthesis is debated due to limited evidence.

“Today, oxygenic photosynthesis is unique to cyanobacteria and their plastid relatives within eukaryotes,” said the paleontologist at the University of Liege. Catherine Dumoulin And her colleagues.

“Although its origins before the Great Oxidation Event are still debated, the accumulation of oxygen profoundly altered Earth's redox chemistry and the evolution of the biosphere, which contains complex life.”

“Understanding the diversification of cyanobacteria is therefore critical to understanding the coevolution of our planet and life, but their early fossil record remains equivocal.”

In their research, Demoulin and his co-authors discovered fossilized photosynthetic structures. Nabyfusa magensis Microfossil.

The microstructure is thylakoid. A membrane-bound structure found inside the chloroplasts of plants and some modern cyanobacteria.

Researchers identified them from fossils taken from three different locations, the oldest of which is from Australia's McDermott Formation and dates to 1.75 billion years ago (Paleoproterozoic era).

Nabyfusa magensis It is thought to be a cyanobacterium. The discovery of thylakoids in specimens from this period suggests that photosynthesis may have evolved at some point 1.75 billion years ago.

However, the mystery of whether photosynthesis evolved before or after the Great Oxidation Event remains unsolved.

Similar ultrastructural analyzes of older microfossils could help answer this question and determine whether the evolution of thylakoids contributed to elevated oxygen levels during the Great Oxidation Event.

“This discovery extends the thylakoid fossil record by at least 1.2 billion years and establishes a minimum age for the divergence of thylakoid cyanobacteria to be about 1.75 billion years ago,” the authors said. .

“This allows for the unambiguous identification of early oxygenic photosynthetic substances and new redox substances for investigating early Earth ecosystems, and for deciphering the paleontology and early evolution of fossil cells. This highlights the importance of examining the ultrastructure of cells.”

team's paper Published in today's magazine Nature.

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CF Dumoulin other. The oldest known fossil cells, thylakoids, provide direct evidence of oxygenic photosynthesis. Nature, published online on January 3, 2024. doi: 10.1038/s41586-023-06896-7

Source: www.sci.news

Fossils dating back 1.75 billion years shed new light on the evolution of photosynthesis

Microscopic image of a modern cyanobacterium called Oscillatoria

Shutterstock / Ekki Ilham

Researchers have identified photosynthetic structures inside a 1.75 billion-year-old cyanobacteria fossil. This discovery is the oldest evidence yet of these structures and provides clues to how photosynthesis evolved.

Emmanuel Javeau Researchers from the University of Liège in Belgium analyzed fossils collected from rocks at three locations. The oldest site is the approximately 1.75 billion-year-old McDermott Formation in Australia, the other two are the billion-year-old Grassy Bay Formation in Canada and the Bllc6 Formation in the Democratic Republic of Congo. was.

From these rocks, the researchers extracted fossilized cyanobacteria that produce energy through photosynthesis. “They're so small, less than a millimeter, that you can't see them with the eye,” Java says. She and her colleagues placed the fossils in resin, sliced ​​them into sections 60 to 70 nanometers thick using a diamond-bladed knife, and analyzed their internal structures using an electron microscope.

They discovered that cyanobacteria in Australia and Canada contain thylakoids, membrane-enclosed sacs in which photosynthesis occurs. “These are the oldest fossilized thylakoids that we know of today,” Java says. Previously, the oldest thylakoid fossils were around 550 million years old. “So we delayed the fossil record by 1.2 billion years,” she says.

This is important because not all cyanobacteria have thylakoids and it is unclear when these structures, which make photosynthesis more efficient, first evolved, they said. Kevin Boyce at Stanford University in California. The origins of this diversification can now be traced back at least 1.75 billion years, he says. The oldest fossils of cyanobacteria are about 2 billion years old, but other evidence, such as geochemical signatures, indicate that photosynthesis has been around even longer than that.

It is widely believed that cyanobacteria helped build up oxygen in Earth's atmosphere 2.4 billion years ago. “The idea is that perhaps during this time they invented thylakoids, which increased the amount of oxygen on Earth,” Java says. “Now that we have discovered very old thylakoids and found them preserved in very old rocks, we think we might be able to test this hypothesis even further back in time,” she says. .

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Source: www.newscientist.com

Explore Our Stunning Collection of This Year’s Top Aurora Photographs

Matthew Brown's entry “Goleuadau'r Gogledd”. Means “Aurora” in Welsh.

Matthew Brown

There are few sights as spectacular as the Northern Lights. The Aurora Photographer of the Year competition, run by travel photography blog Capture the Atlas, takes advantage of the dazzling effects of the Northern Lights.

The waning sun photographed on Senja Island in Norway

alex wides

This year, 25 breathtaking shots from around the world made it to the final round, and we've published a selection of them here. Each brings a special aspect to this unusual phenomenon caused by charged particles from the sun colliding with atmospheric gases.

“Circle of Life” filmed in Finland at almost -30 degrees Celsius

Freudis Dalheim

As the sun's next peak in activity (known as the solar maximum) approaches in 2024, people are already able to catch glimpses of the aurora borealis over a wider area than usual in both the north and south. Next year's exhibition will be even more spectacular.

“A moment on the ice” taken from an ice cave in Alaska, USA

marybeth kitzenski

'Lost Who I Want To Be' filmed at Moke Lake in New Zealand

Jordan McInally

Many of the photos in the 2023 competition were taken in locations where the Northern Lights are rare, such as south Wales, and are captured in Matthew Brown's photography. Goreuadau's Goggled (Main image). The name translates to 'lights of the north' in Welsh and images show local landmark Paxton's Tower lit up. “It's rare to see the aurora borealis this far south,” Brown said. “For more than an hour, the horizon beyond the clouds cast shades of green and pink. But for one brief but magical moment, the sky burst

Source: www.newscientist.com

Researchers Discover the Root Cause of a Historic, Lethal Climate Shift Millions of Years in the Past

Scientists have linked mass extinctions and climate change over the past 260 million years to massive volcanic eruptions and Earth’s astronomical cycles. The study highlights the role of CO2 emissions in climate change and reveals a complex relationship between Earth’s geology and position in space that is distinct from modern anthropogenic climate change.

New research reveals that Earth’s geological history is tied not only to the planet’s interior, but also to its astronomical movements.

The team of scientists concluded that it has occurred over the past 260 million years and that the mass extinction of life caused during these periods was primarily caused by large-scale volcanic eruptions and the resulting environmental crisis.

The analysis published in the magazine earth science reviews indicate that these eruptions released large amounts of carbon dioxide into the Earth’s atmosphere, resulting in extreme greenhouse climate warming and creating lethal or deadly conditions on Earth.

Astronomical cycles and Earth’s climate

Importantly, these phenomena occur every 26 to 33 million years and coincide with significant changes in the orbits of the solar system’s planets, which follow the same periodic pattern, the researchers added.

“Earth’s geological processes, long thought to be strictly determined by events inside the planet, may actually be controlled by the solar system and Earth’s astronomical cycles. milky way Galaxy,” says Professor Michael Lampino. new york university Department of Biology and senior author of the paper. “Importantly, these forces have converged many times in Earth’s past to predict dramatic changes in climate.”

The researchers, including Ken Caldeira of the Carnegie Institution for Science and geologist Sederia Rodriguez of Barnard College, say their conclusions are unrelated to climate change in the 20th and 21st centuries, and that scientists believe that human It warns that it shows that it is caused by activity. The last studied pulse of volcanic eruptions occurred about 16 million years ago.

But they added that the analysis nevertheless supports the well-established impact of carbon dioxide emissions on climate warming.

Volcanic eruptions and geological phenomena

Researchers have identified Continental Flood Basalt (CFB) eruptions, the largest volcanic eruptions on Earth with lava flows covering nearly 500,000 square miles, and other major geological events over the past 260 million years. focused. These include ocean anoxic events (periods during which the Earth’s oceans are depleted of oxygen, thereby producing toxic water) and the hyperthermal climate pulse, a sudden increase in global temperature and the resulting ocean and periods of mass extinction of non-marine life. .

They found that CFB eruptions frequently coincided with these other deadly geological phenomena, revealing the larger impact of volcanic activity. Its relevance to astronomy is evidenced by its regular, multimillion-year cycles of volcanic activity and extreme weather events, and its similarities with the known orbital periods of the Earth in our solar system and Milky Way galaxy.

The authors found that the correspondence between geological and astrophysical cycles was too close to be a mere coincidence. The big problem they were left with was how The astronomical movements of the planets disrupt the geological engines inside the Earth.

“This is an unexpected connection and predicts a convergence of both astronomy and geology. Events that occur on Earth occur within the context of our astronomical environment,” Rampino said. Observe.

References: “Periods of ~32.5 My and ~26.2 My in correlated episodes of continental flood basalts (CFBs), hyperthermal climate pulses, anoxic oceans, and mass extinctions over the past 260 My years: geological and astronomical cycles. Relationships” by Michael R. Rampino, Ken Caldeira, and Cederia Rodriguez, September 25, 2023. earth science reviews. DOI: 10.1016/j.earscirev.2023.104548

Source: scitechdaily.com

Early Detection of Parkinson’s Disease Possible 30 Years Before Onset of Symptoms, Scientists Find

Researchers have discovered a way to detect Parkinson’s disease up to 30 years before symptoms appear using biomarkers and PET scans. This breakthrough includes tracking neurodegeneration more sensitively than current methods and shows that rapid eye movement sleep behavior disorder (RBD) is an important early indicator of Parkinson’s disease. is identified. This discovery could lead to earlier diagnosis and treatment, potentially up to 10 years earlier than currently.

Researchers at The Florey and Austin Health in Melbourne, Australia, have demonstrated the potential to identify early indicators of Parkinson’s disease 20 to 30 years before the onset of symptoms. This breakthrough paves the way for early screening programs and intervention, potentially allowing treatment before significant damage occurs.

Researchers at the Florey Institute and Austin Health have demonstrated the possibility of identifying early indicators of Parkinson’s disease 20 to 30 years before the onset of symptoms. This breakthrough paves the way for early screening efforts and preventive treatment, long before permanent damage occurs.

Florey Professor Kevin Burnham said that although Parkinson’s disease, a debilitating neurodegenerative disease, is often thought of as a disease of the elderly, it actually begins in midlife and can last for decades. He said it may not be detected.

“Parkinson’s disease is very difficult to diagnose until symptoms become apparent, by which time up to 85 percent of the neurons in the brain that control motor coordination have been destroyed. At that point, many treatments are likely to be ineffective,” Professor Burnham said. “Our long-term goal is to find ways to detect diseases earlier and treat people before they cause harm.”

Advanced diagnostic technology

In a recently published study, neurologylead researcher Professor Burnham and colleagues explore how a known biomarker called F-AV-133 can be used in positron emission tomography (PET) scans to diagnose Parkinson’s disease and accurately track neurodegeneration. I’m explaining how it can be done.

In the Melbourne study, Austin Health’s Frawley Professor Chris Rowe and his team studied 26 patients with Parkinson’s disease, 12 controls, and 11 patients with rapid eye movement sleep behavior disorder (RBD), a strong indicator of Parkinson’s disease. I checked the name. .

Each person underwent two PET scans two years apart. Key findings include:

  • Currently available assessments of Parkinson’s disease showed no significant changes in clinical symptoms in any of the participants.
  • In contrast, PET scans showed “significant neuronal loss” in three key areas of the brains of people with the disease, making F-AV-133 more effective than what is currently available. also suggests that it is a sensitive means of monitoring neurodegeneration.

Further mathematical modeling yields the following calculation:

  • Slow nerve cell loss over a total of approximately 33 years in Parkinson’s disease
  • This loss takes about 10.5 years before the disease is detected on a PET scan.
  • Even if a PET scan detects the disease, it will take another six and a half years for motor symptoms to appear.
  • It takes about 3 years after physical symptoms appear until a clinical diagnosis is confirmed.
  • This corresponds to approximately 22.5 years of neuronal loss before clinical symptoms are sufficient for diagnosis.

Professor Burnham said the findings pave the way for the development of screening protocols to diagnose and treat Parkinson’s disease up to 10 years earlier than is currently possible. It may also help identify patients for clinical trials.

What is RBD?

  • RBD stands for Rapid Eye Movement Behavior Disorder.
  • Patients with RBD scream, thrash, and sometimes move violently during sleep, enacting vivid and disturbing dreams.
  • RBD is caused by a lack of muscle relaxation (sleep paralysis).
  • 90% of RBD patients develop Parkinson’s disease.
  • Half of all Parkinson’s patients have RBD.
  • RBD is an important warning sign for early Parkinson’s disease.
  • If you have RBD, see a sleep specialist or neurologist.

Reference: “Use of 18F-AV-133 VMAT2 PET Imaging to Monitor Progressive Nigrostriatal Degeneration in Parkinson’s Disease”, Leah C. Beauchamp, Vincent Dore, Victor L. Villemagne, SanSan Xu, David Finkelstein, Kevin J. Barnham, Christopher Rowe, 28 November 2023 neurology.
DOI: 10.1212/WNL.0000000000207748

Source: scitechdaily.com

Archaeologists in Mongolia uncover ancient wooden saddle dating back 1,600 years

New archaeological discoveries in Mongolia show that, despite a fragmentary archaeological record, horse cultures in the eastern Eurasian steppes early adopted framed saddles and stirrups, at least by the turn of the 5th century AD. It shows. His 1,600-year-old saddle, discovered at Urd Ulan Unito, is one of the earliest known examples of a wooden-framed saddle, indicating that it was locally produced and a link to earlier saddle traditions. Both show evidence of a connection. The recent discovery of Khufu Nur suggests that stirrups were also used in the Mongolian steppes at the same time as they first appeared elsewhere in East Asia.

Birch composite frame saddle (top left) from Urud-Ulan-Unit, Mongolia and artist’s restoration. Image credit: P. Lopez Calle.

Horseback riding appears to have been little attempted as a regular mode of transportation until the late 2nd millennium BC or early 1st millennium BC, although some archaeological data suggests that horses were used in Eastern Europe by the early 2nd millennium BC. This suggests that it could have been ridden. Grassland.

Early iconography, written sources, and archaeological finds indicate that in regions of western Eurasia, these first horsemen used simple blankets or soft pads with their legs suspended and separating rider and horse. Basically, I often rode naked.

The Greek writer and soldier Xenophon, writing in the 4th century BC, outlined best practices for cavalry riding, including riding naked, holding the horse only by the upper thighs, letting the lower legs dangle, and holding the mane. I explained the Greek tradition. More security.

Despite their near-ubiquitous use among modern horsemen, neither stirrups nor true saddles appear to have been used by early equestrians.

The earliest direct evidence of mounted horses in the equid family is from mounted cavalrymen in Mesopotamia and the Levant who interbred with donkeys in the third millennium BC.

By the middle of the first millennium BC, at the same time as cavalry was emerging across Eurasia, soft-padded saddles made of leather and stuffed with fur, textiles, and other materials and secured to the horse with a girth strap were being adopted in the Eurasian interior. I did.

These early saddles were sometimes reinforced with wooden or horn supports, and sometimes secured to the horse’s chest or hindquarters with chest straps or clappers.

Throughout Eurasia, by the beginning of the first century AD, simple saddles were adopted for greater safety.

In western Eurasia, Roman military saddles incorporated four large “horns” and grips to increase stability for mounted soldiers. It may also contain hard internal components, but this is debated.

Early semi-structured saddles probably provided greater comfort and safety for rider and horse, and allowed mounted and armored soldiers to handle blunt weapons and swords more directly.

These innovations in saddle stability allowed riders to withstand collisions and ride more heavily armed, allowing heavy cavalry to replace chariots on the battlefield throughout Eurasia by the end of the first millennium BC. It was helpful.

In East Asia, parallel developments were underway towards structured saddles.

Excavations of the tombs of the Xiongnu (c. 200 BC – c. 100 AD), the first steppe empire of Mongolia, have shown that padded saddles are usually supplied with a croupier and/or chest strap to secure the saddle in place. revealed that it had a hard pommel/cantle. Components were also commonly used.

By the 6th century, in East and Central Asia, primitive saddles had been replaced by sophisticated composite frame saddles combined with two metal ribs.

“Ultimately, the technologies that emerged from Mongolia had a domino effect that shaped today’s American horse culture, particularly the tradition of harnesses and stirrups,” said William Taylor, an archaeologist at the University of Colorado Boulder. said.

“But these insights come at a time when Mongolia’s horse culture is beginning to disappear,” added Dr. Jamsranjab Bayarsaikhan, an archaeologist at the Max Planck Institute for the Science of Human History.

“Horses not only influenced the history of the region, but also left a deep mark on the art and worldview of the nomadic Mongolians.”

“However, the age of technology is slowly erasing the culture and use of horses. In the plains of Mongolia, horse-riding pastoralists are increasingly being replaced by motorcyclists.”

In April 2015, Dr. Bayarsaikhan and his colleagues at the National Museum of Mongolia received a report from the police that the Urd Ulan Unit cave burial site in Myangad Sum, Khovd province, had been destroyed by looters.

Police seized some organic material that was well preserved in the cave’s dry environment.

An intact wooden saddle was also recovered from Urd Ulan Unito Cave.

The saddle was made of about six birch pieces held together with wooden nails.

The black trim has red paint marks and contains two leather straps that may have once supported the stirrups.

Archaeologists have not been able to definitively trace where those materials came from. However, birch trees commonly grow in the Altai Mountains of Mongolia, suggesting that local people were not trading saddles, but were making them themselves.

“Since the early days of horseback riding, humans have used pads, the precursor to saddles, to keep horses comfortable after riding,” Dr. Taylor said.

“The combination of a sturdier wooden saddle and stirrup opens up new ranges of what people can do with their horses.”

“One of the things they created was heavy cavalry and fierce fighting on horseback. Think of the jousting of medieval Europe.”

“In the centuries after the Mongol saddle was made, this type of tool quickly spread throughout western Asia and into the early Islamic world.”

“There cavalry was the key to conquering and trading with the Mediterranean region and much of North Africa.”

“But where it all started is less clear. Archaeologists usually think that the birthplace of the first frame saddles and stirrups is modern-day China, and some finds date back to the 5th century AD. It dates back to the 6th century or earlier.

“But our research complicates that picture. It is possible that Mongolia may have been the first to adopt these new technologies, or may actually be the place where the innovations first took place.” This is not the only information that suggests this.”

“Mongolia’s place in its history may have been underestimated for a long time because of the region’s geography.”

“The country’s mountainous regions have some of the lowest population densities on earth, making it difficult to encounter and analyze important archaeological finds.”

“Mongolia is one of the few countries that has preserved horse culture from ancient times to modern times,” said Dr. Bayarsaikhan.

“However, scientific understanding of the origins of this culture is still incomplete.”

team’s findings Published in this month’s magazine ancient.

_____

Jamsranjaf Bayarsaikhan other. Origins of saddles and horse riding techniques in East Asia: Discoveries from Altai, Mongolia. ancient, published online on December 12, 2023. doi: 10.15184/aqy.2023.172

Source: www.sci.news

Co-founder of Credit Karma, Nicole Mustard, resigns after 16 years in the company

Credit Karma co-founder and chief revenue officer Nichole Mustard is leaving the company after 16 and a half years, TechCrunch exclusively learned today.

A spokesperson for the consumer fintech, now a subsidiary of Intuit, confirmed Mustard’s departure in an email, writing only: “We are certain that she has decided to leave the company. Her contribution has been significant and we wish her all the best.”

Mr. Mustard’s decision to step down marks the third high-profile departure of an executive at Credit Karma in 2023. Verified blind user. Colleen McCleary, Chief Human Resources Officer He resigned from his role in January and joined Ribbit Capital as an investor in June. In September, Greg Lulu announced: resign from the position of chief marketing officer As soon as his replacement is found.

Intuit closes with $8.1 billion in cash and stock sales purchase Credit Karma took a big hit in 2020, and things have been a bit volatile ever since.

Last November, Credit Karma confirmed to TechCrunch that it had “decided to pause substantially all hiring activities” due to “revenue challenges due to an uncertain environment.” At that time, we shared within the company: All credit karma areas were “negatively affected by macro uncertainty,” it said. Credit Karma experienced further deterioration in these areas in the final weeks of the first quarter [of 2022]”

In August, Intuit reported that Credit Karma confirmed the situation. decrease in income For the fiscal year ending July 31, 2023, it will increase 9% to $1.6 billion. Earlier this year, Intuit announced that: Personal finance app “Mint” terminated In January.intuition Acquired the Mint in 2009and the decision to close it came as a surprise to many.

Have a news tip or inside scoop on a topic we’ve covered? We’d love to hear from you. Contact us at maryann@techcrunch.com. Or send us a note at tips@techcrunch.com. We will be happy to honor your request for anonymity.

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Source: techcrunch.com

Rediscovery of Fazilde’s trapdoor spider after 92 years in Portugal

Fazilde’s trapdoor spider rediscovered in northern Portugal

Sergio Enriquez/Re:wild

The elusive trapped spider has been rediscovered in a small village in Portugal after 92 years of disappearance.

Fazilde’s Trapdoor Spider (Nemesia berlandi) was first described in 1931 after an entomologist discovered a pair of females just outside the small village of Fajilde in northern Portugal. According to two specimens collected at the time, the female has a dark brown body and is thought to be about 2.2 centimeters in length at most.

This species belongs to a family of trapdoor spiders called Arachnidae, whose members live in burrows with hinged doors to catch unsuspecting prey. Although males have not been observed, scientists believe they behave similarly to related spiders, performing rhythmic tap dances on female doorsteps to attract mates.

Since its discovery, Fazilde’s trapped spider appears to have disappeared, and the species was considered lost to science.

“We tend to miss them because they’re so cryptic. They have trapdoors that look exactly like the background they have in the area, including leaves and moss,” he says. Sergio Enriquez At the Indianapolis Zoo in Indiana.

In 2011, Enriquez and his colleagues discovered a series of horizontal burrows around Fazilde and suggested that: N. Berlandi It may be the only spider among spiders that does not grow vertically.

After a two-year expedition in the Fazilde forest area, the team finally discovered this reclusive spider for the first time in 92 years.

They stumble upon a horizontal burrow and find a deep brown female spider and her children. This female matched the first description of Fazilde’s trapdoor spider, described in 1931.

“This discovery was like winning the lottery while being struck by lightning,” Enriquez said.

To confirm that it really was N. BerlandiThe research team analyzed its DNA samples and found that it was different from other known trapdoor species.

Enriquez and his colleagues hope the rediscovery will spur efforts to protect the spider, which lives in areas of the country threatened by wildfires and flooding.

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Source: www.newscientist.com

The Revealed True Nature of Magellan’s Stars After 50 Years of Exploration

An artist’s rendition of the Magellanic Star Stream, depicting the Small and Large Magellanic Clouds, the Milky Way’s nearest neighbors, is shown in the diagram. The gaseous Magellanic Stream swirls behind the galaxies, spreading across the southern sky as they move, with 13 red giant stars discovered within the stream.

Astronomers from the Center for Astrophysics at Harvard University and the Smithsonian University have solved a 50-year-old mystery by identifying stars within the Magellanic Stream. The discovery helps reveal the distance to the stream, providing new insights into the history and characteristics of our galaxy and its neighbors.

The study, published in the Astrophysical Journal, showcases the discovery of 13 stars within the stream and their unique characteristics that place them precisely within the mysterious structure. The stars’ distances and chemical compositions offer clues to the formation of the Magellanic Stream and the interactions of the Magellanic Clouds with the Milky Way.

By conducting a spectroscopic analysis of distant Milky Way stars, researchers were able to determine their chemical makeup and velocity, ultimately allowing them to identify stars within the Magellanic Stream. This discovery also sheds light on the origin and gravitational pull of the stream, as well as its potential role in the future formation of new stars within the Milky Way.

The Magellanic Stream, which acts as a supplier of cold neutral gas for the formation of Milky Way stars, also holds valuable insights into the composition of galaxies and the distribution of dark matter. Further study of the stream and additional discoveries of stars are expected to provide more surprises and lead to a deeper understanding of our galaxy’s outer reaches.

Source: scitechdaily.com

12 Billion Years Ago, JWST Uncovers Secrets of Star-Forming Galaxies

Thanks to the James Webb Space Telescope, astronomers discover that most early galaxies from about 12 billion years ago had more glowing gas than stars due to interactions with neighboring galaxies. I was able to.

This groundbreaking result provides new insights into the evolution of galaxies and the early Universe, and highlights the transformative impact of JWST on astrophysics.

New images from the James Webb Space Telescope (JWST) have helped Australian astronomers uncover the secrets of how infant galaxies began a burst of star formation in the very early universe .Some early galaxies were rich in gas that shined brighter than emerging stars. In a new study, astronomers have discovered just how prevalent these bright galaxies were about 12 billion years ago. Images from JWST show that nearly 90% of galaxies in the early Universe had this glowing gas, creating so-called “extreme emission line features. An image of a distant polar emission galaxy. Observed by the James Webb Space Telescope (left) and the Hubble Space Telescope (right). This comparison highlights the sharpness of the JWST images. Credit: ARC Center of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)

“The stars in these young galaxies were amazing, producing enough radiation to excite the gas around them. This gas, in turn, shined even brighter than the stars themselves.” said Dr. Anshu Gupta, Curtin University Node of the ARC Center for Three-Dimensional All-Sky Astrophysics (ASTRO 3D) and the International Radio Astronomy Research Center.Iqral), lead author of the paper describing this finding. “Until now, it has been difficult to understand how these galaxies are able to accumulate so much gas. Our discovery suggests that each of these galaxies had at least one neighboring galaxy. This suggests that interactions between these galaxies cool the gas and trigger intense star formation episodes, resulting in this extreme luminescence property.” Progress in observing galaxies in the early universe

This discovery is an example of the unparalleled clarity the JWST telescope provides in studying the early universe.

“The quality of data from the James Webb Telescope is exceptional,” says Dr. Gupta. “It has the depth and resolution necessary to observe the surroundings and neighboring galaxies of early galaxies, when the universe was just 2 billion years old. We were able to confirm that there are significant differences in the number of neighboring galaxies among galaxies that do not.”

The target galaxy observed by the James Webb Space Telescope (left) and the Hubble Space Telescope (right). The unprecedented resolution and sharpness of the JWST images allowed us to identify neighboring galaxies (cyan circles) that were not even visible to Hubble. Credit: ARC Center of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D

Until now, we’ve struggled to get clear images of galaxies whose universe is about 2 billion years old. Since many stars had not yet formed, there were far fewer galaxies to focus on, making the task even more difficult.“Before JWST, we could only get pictures of really huge galaxies, most of which were in very dense galaxy clusters, making them difficult to study,” says Dr. Gupta. “With the technology available at the time, it was not possible to observe 95% of the galaxies used in this study. His Webb telescope revolutionized our research.

An image of a distant polar emission galaxy. Observed by the James Webb Space Telescope (left) and the Hubble Space Telescope (right). This comparison highlights the sharpness of the JWST images. Credit: ARC Center of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)

Checking previous assumptions
The discovery proved an earlier assumption, said fellow author Tran, associate director of ASTRO 3D and the Harvard University and Smithsonian Center for Astrophysics. “We suspected that these extreme galaxies were signposts of intense interactions in the early universe, but only with JWST’s keen eye could we confirm our hunch.” she says.

The study is based on data obtained as part of the JWST Advanced Deep Extragacular Survey (JADES) survey, which uses deep infrared imaging and multi-object spectroscopy to explore the universe for the earliest galaxies. It paves the way for further insights. “What’s really interesting about this study is that we see similarities in emission lines between the first galaxies and galaxies that formed more recently and are easier to measure. It means we now have more ways to answer difficult questions about the early Universe,” said second author Ravi Jaiswal, PhD student at Curtin University/ICRAR and ASTRO 3D.

“This research is at the heart of the work of our Galaxy Evolution Programme. Understanding what earlier galaxies looked like will help us answer questions about the origins of the elements that make up all of our daily life on Earth. We can,” said Professor Emma Ryan-Weber, ASTRO 3D Director.

Reference: “MOSEL study: JWST reveals massive mergers/strong interactions in the early universe driving extreme emission lines” Anshu Gupta, Ravi Jaiswar, Vicente Rodriguez-Gomez, Ben Forrest, Kim -Vy Tran, Themiya Nanayakkara, Anishya Harshan, Elisabete Da Cunha, Glenn G. Kapsack, Michaela Harshman, of astrophysical journal.

DOI: 10.48550/arXiv.2311.02158

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Source: scitechdaily.com