Planetary nebula Abell 33 appears ring-like in this image, taken using the European Southern Observatory's Very Large Telescope. The blue bubble was created when an aging star shed its outer layers and a star in the foreground happened to align with it to create a "diamond engagement ring" effect. Click through to see other wonders of the universe.
(European Southern Observatory)
Read the article: Astronomers find 'diamond engagement ring' in space