planetary nebula
- n a nebula that was once thought to be a star with its planets but is now thought to be a very hot star surrounded by an expanding envelope of ionized gases that emit a fluorescent glow because of intense radiation from the star
planetary nebula :
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- Wired Space Photo of the Day: Spirograph Nebula
Glowing like a multi-faceted jewel, the planetary nebula IC 418 lies about 2, 000 light-years from Earth in the constellation Lepus. In this picture, the Hubble telescope reveals some remarkable textures weaving through the nebula. Their origin, however, is still ...
June 19, 2013 - Wired News