NASA’s Exciting Test Phase for Dream Chaser

NASA and Sierra Space are making progress toward the company’s Dream Chaser spacecraft’s maiden flight to the International Space Station. The unmanned cargo spaceplane is scheduled to begin demonstration missions to orbital complexes in 2024 as part of NASA’s commercial resupply services. Credit: Sierra Space

NASA and Sierra Space are testing the Dream Chaser spacecraft at the Neil Armstrong Test Facility, with a focus on environmental simulation for future ISS missions. After testing, the spacecraft will head to Kennedy Space Center for launch in 2024.

NASA and Sierra Space are preparing for the maiden flight of their Dream Chaser spacecraft. international space station. Dream Chaser and its accompanying cargo module “Shooting Star” NASA’s Neil Armstrong Test Facility It will fly in Sandusky, Ohio, for environmental testing, scheduled to begin in mid-December ahead of its first flight scheduled for early 2024.

State-of-the-art testing equipment

The Neil Armstrong Test Facility, part of NASA’s Glenn Research Center in Cleveland, has multiple test facilities including the Space Environment Complex and the Space Propulsion Facility, both of which will be home to Dream Chaser. The complex includes a mechanical vibration facility that exposes test articles to the harsh conditions of launch.

During Armstrong’s stay, the Dream Chaser winged spacecraft will be stacked atop the Shooting Star cargo module on a vibration table, experiencing vibrations similar to those experienced during liftoff or atmospheric re-entry.

NASA and Sierra Space are making progress toward the company’s Dream Chaser spacecraft’s maiden flight to the International Space Station. The unmanned cargo spaceplane is scheduled to begin demonstration missions to orbital complexes in 2024 as part of NASA’s commercial resupply services. Credit: Sierra Space/Shay Saldana

Rigorous space simulation

After vibration testing, Dream Chaser will be moved to the propulsion facility for thermal vacuum testing. Dream Chaser is placed in a vacuum and exposed to low ambient pressure, low background temperature, and simulated dynamic solar heating, simulating the environment the spacecraft will encounter during its mission. This facility is the only facility capable of testing full-scale upper stage rockets and rocket engines under simulated space conditions and conducting high-temperature fires.

After testing at Armstrong, Dream Chaser will be transported to NASA’s Kennedy Space Center in Florida for further launch preparations, and is currently scheduled to launch in the first half of 2024.

Source: scitechdaily.com

FTC warns of increasing QR code scams – Tips to safeguard against them

Since the COVID-19 pandemic, codes have grown in popularity and their use in the form of paperless menus and invoices has skyrocketed. But the convenience and efficiency of scannable codes comes with threats. Users can easily fall victim to fraud. According to a report by Check Point cybersecurity experts: 587% increase In phishing, or “kissing,” the Federal Trade Commission is also warning consumers who may be putting their personal information at risk. Cybercriminals send legitimate codes (also known as “quick response” codes, traditionally seen as a mix of white and black pixels that direct the scanner to a website) by sending the scanner to a fake site. It can be hidden with a unique code that steals personal and private information. Install malware. Fake codes can be found in public places, such as parking meters, or sent via texts or emails claiming there was suspicious activity on your account or there was a problem with your package delivery. There is also. The coronavirus pandemic has seen a surge in the use of codes, offering consumers a completely paperless way to view menus, pay bills, and fill out forms. adobe stock “We want you to scan a code and open a URL without thinking,” the FTC said. was warned about Wednesday’s blog post. To protect yourself, the FTC advised inspecting before opening them to make sure they haven’t been spoofed by misspellings or transposed characters. The agency also recommends not opening codes from unexpected communications (such as urgent messages indicating problems with your account), keeping your phone updated and enabling two-factor authentication. The FTC warned the public not to scan random codes and to be suspicious of unsolicited communications containing codes. adobe stock The Federal Bureau of Investigation’s September blog post also urged consumers to be skeptical and “suspicious” of codes that request login information after scanning, and further warned consumers not to scan codes that appear to have been “tampered with.” did.

Source: nypost.com

A cluster of stripped helium stars found in the Magellanic Cloud by astronomers

Removing the hydrogen-rich layer from a main-sequence star exposes the helium-rich core. Such stripped helium stars are known at high and low masses, but not at intermediate masses, despite theoretical predictions that they should be common. In a new study, astronomers at the University of Toronto and elsewhere used ultraviolet photometry to identify candidates for stripped helium stars in two nearby dwarf galaxies, the Large and Small Magellanic Clouds. We observed 25 such candidate stars using optical spectroscopy. Most of these systems have been shown to be binary systems, with the companion star likely stripping the helium star of its outer hydrogen-rich layer.

An artist’s impression of a large-scale binary system. Image credit: ESO / M. Kornmesser / SE de Mink.

The hydrogen-rich outer layers of massive stars can be removed by interactions with binary companions.

Theoretical models predict that this separation would produce a population of hot helium stars with masses between two and eight times the mass of the Sun, but only one such system has been identified to date.

“This was a very large and noticeable hole. If these stars turn out to be rare, it could affect supernovae, gravitational waves, light from distant galaxies, and our theories for all these different phenomena. The whole framework is wrong,” said Dr Maria Draut, an astronomer at the university. of Toronto.

“This discovery shows that these stars actually exist.”

“In the future, we will be able to perform even more detailed physics on these stars.”

“For example, predictions of how many neutron star mergers we will see depend on the properties of these stars, such as how much material is ejected by stellar winds.”

“In the past, people have estimated it, but now for the first time they will be able to measure it.”

Dr. Drout and her colleagues designed a new study to look at the ultraviolet part of the spectrum, where very hot stars emit most of their light.

Astronomers used data from the Swift Ultraviolet/Optical Telescope to collect the brightness of millions of stars in the Large and Small Magellanic Clouds, the two closest galaxies to Earth.

They developed the first wide-field UV catalog of the Magellanic Clouds and used UV photometry to detect systems with unusual UV emissions indicating the possible presence of stripped stars.

They acquired optical spectroscopy with the Magellan Telescope at the Las Campanas Observatory from 2018 to 2022 and conducted pilot studies on 25 objects.

These stripped stars had high temperatures (60,000 to 100,000 K), high surface gravity, and hydrogen-depleted surfaces. Sixteen stars also showed binary motion.

Drout and his co-authors propose that these stars will eventually explode as hydrogen-depleted supernovae.

These objects, like the gravitational wave-emitting objects detected from Earth by the LIGO experiment, are also thought to be necessary for the formation of neutron star mergers.

In fact, researchers believe that some of the objects in the current sample are neutron stars or stripped stars with black hole companions.

These objects are on the verge of becoming double neutron stars or neutron star and black hole systems that may eventually merge.

“Many stars are part of a cosmic dance with partners, orbiting each other in binary star systems,” says Dr. Bethany Ludwig. He is a student at the University of Toronto.

“They are not solitary giants, but part of a dynamic duo, interacting and influencing each other throughout their lives.”

“Our research sheds light on these fascinating relationships, revealing a universe far more interconnected and active than previously imagined.”

“Just as humans are social beings, stars, especially massive stars, are rarely lonely.”

of result appear in the diary science.

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MR Drought other. 2023. Observed population of intermediate-mass helium stars separated by binaries. Science 382 (6676): 1287-1291; doi: 10.1126/science.ade4970

Source: www.sci.news

Apple’s latest update includes security measures to protect stolen phones from hacking attempts by thieves

This is the perfect protection against hacking attacks.

Have you ever felt dizzy thinking your phone might be stolen? There’s no need to worry. Apple has devised a powerful new weapon in the fight against cybercrime. It’s a new IOS update called Stolen Device Protection that prevents thieves from accessing your smartphone with stolen passwords.

“In rare cases, a thief can steal your device by watching you enter your passcode, but Stolen Device Protection adds a sophisticated new layer of protection,” an Apple spokesperson said, says the person. said in a statement.

This bold new security feature, released Tuesday as an iOS 17.3 developer beta, is especially useful when users change their Apple ID password, remove Face ID, or remove other sensitive features. , requires the use of a biometric access code such as a face or fingerprint.

Whenever a user’s device is in an unfamiliar location, stolen device protection is initiated and the user is then required to complete the aforementioned protocol.


“In the rare case that a thief steals your device by watching you enter your passcode, Stolen Device Protection adds a sophisticated new layer of protection,” an Apple spokesperson said. Masu. Denphoto – Stock.adobe.com

As an additional safeguard against “smash-and-grab” operations, users must re-enter their data after an hour to confirm the change, effectively rendering any passcode hacking attempt futile.

Stolen Device Protection is currently only available to beta testers, but will be available to all users once Apple releases the final version of iOS 17.3. TechCrunch reported.

An Apple spokesperson said the move is part of an ongoing campaign to protect smartphone users “as threats to user devices continue to evolve.”

Last month, the release of a new iPhone feature, NameDrop, set off alarm bells. This allows a user to instantly share contact information with his iPhone or Apple Watch nearby, instead of physically handing the phone over to someone.

While it did speed up the information exchange process, viewers became concerned that users were unknowingly sharing their information with unknown iPhone users.

Source: nypost.com