Planetary nebula

A planetary nebula was a type of emission nebula created by matter expelled from a star reaching the end of its life.
The crew of surveyed a planetary nebula in 2151, at which time they detected a Vulcan survey ship apparently shadowing their activities. This happened three weeks before Enterprise encountered the Ti'Mur. ()
==Examples==
* Jonisian Nebula
* M2-9
== External link ==
* 
Category:Celestial objects