Is this the universe's biggest bubble?

摘要

It looks like a soap bubble or perhaps even a camera fault, but the image above is a newly discovered planetary nebula.rnPlanetary nebulae, which got their name after being misidentified by early astronomers, are formed when an ageing star ejects its outer layers as clouds of luminous gas. Most are elliptical, double-lobed or cigar-shaped, evolving after stars eject gas from each pole.