The shockwave has traveled half a light-year.
Decades in the making, NASA's X-ray timelapse shows a stellar explosion expanding into space at up to 2% the speed of light.
Two Princeton researchers, Alicia Soderberg and Edo Berger, have become the first humans in recorded history to witness the explosion of a supernova in real time. Soderberg, who is a postdoctoral ...
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