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Imagine looking up at the night sky 1,000 years ago; you would likely see an additional point of light compared to today. Back then, Chinese astronomers referred to these phenomena as “guest stars,” believing they foretold significant changes.
Today, we understand these were likely supernovae—spectacular explosions from dying stars—one of many serendipitous discoveries made by astronomers observing at opportune moments.
In the modern era, the quest for these “transient” events has evolved into a strategic approach, revolutionizing the field of astronomy. We have since identified numerous fleeting events that span from mere nanoseconds to durations longer than a human lifetime.
“Astronomy considers both spatial and temporal scales, yet the latter remains largely unexplored,” states Jason Hessels from the University of Amsterdam.
To capture these ephemeral occurrences effectively, astronomers are innovating by synchronizing telescopes into a cohesive unit, akin to a well-oiled machine, as evidenced by the Palomar Temporary Factory project from 2009 to 2012. One significant flash observed by a telescope in San Diego prompted immediate follow-up investigations by others. “It was orchestrated like a conveyor belt,” Hessels remarked.
More specialized telescopes are emerging, focusing on time, rather than just space. Notably, the Zwicky Temporary Facility has taken over from Palomar, and the Pan-STARRS survey amassed 1.6 petabytes of astronomical data—recording the largest dataset ever captured from Hawaii.
These advanced telescopes have generated extensive data that unveil the twinkling and fluctuating events of the cosmos, including gamma-ray bursts, fast radio bursts, gravitational waves, and stars that either explode spontaneously or are ripped apart by black holes.
Transient astronomy is reshaping our perception of the universe. “We’ve progressed from painting to photography, and now to some form of stop-motion film,” Hessels describes. He continues, “We’re approaching a complete narrative. Each adjustment in my perspective of the sky feels as though the cinematic experience expands further.”
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Source: www.newscientist.com
