nuclear fuel? The center condenses into a white dwarf while the outer atmospheric layers are expelled into space and appear as a planetary nebula. This particular planetary nebula, designated Shapley 1 after the famous astronomer Harlow Shapley, has a very apparent annular ring like structure. Although some of these nebulae appear like planets on the sky (hence their name), they actually surround stars far outside our Solar System.
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& Michigan Tech. U.
Based on Astronomy Picture Of the Day
Publications with keywords: nebula - annular - planetary nebula - Shapley 1
Publications with words: nebula - annular - planetary nebula - Shapley 1