| Sure enough, there was a huge shell of clumpy, hole-riddled gas that looked like a nearly dissipated planetary nebula. |
| Astronomers call such an object a planetary nebula, because its round shape resembles that of a planet when viewed with a small telescope. |
| The Boomerang Nebula is a young planetary nebula and the coldest object found in the Universe so far. |
| A planetary nebula forms when Sun-like stars gently eject their outer gaseous layers to form bright nebulae with amazing twisted shapes. |
| A star has actually, under our eyes, become a planetary nebula, and the cycle of which he gave the first terms is complete. |
| In keeping with astronomical tradition, the new planetary nebula will probably be named after its lead discoverer. |
