|What happens when a star runs out of
For stars about the mass of our Sun, the center condenses into a
while the outer atmospheric layers are
expelled into space and appear as a
pictured above and designated
Shapley 1 after the famous astronomer
Harlow Shapley, has a very apparent annular ring like structure.
Although some of
appear like planets on the sky
(hence their name), they actually surround stars far outside
our Solar System.