It may be one of the most iconic sights in the night sky, but astronomers have never seen the Helix Nebula like this before.
"Until now, it was unknown what type of star would remain after the merger." ...
An extremely early Type II supernova explosion, named after the Titan goddess of dawn in Greek mythology, occurred just 1 ...
One of the most stubborn issues in cosmology today concerns the universe's rate of expansion. Scientists know it's expanding, ...