Planetary nebula

Planetary nebula

View gallery

15 photos

The term "planetary nebula" dates back to the 18th century when astronomers thought these glowing blobs looked like distant gas giants. A planetary nebula is actually made up of the shells of stellar material ejected from dying stars that have passed through the red giant phase after starting to run out of fuel.

Sorry you didn't like this comment. Please provide a reason below.

Are you sure?
Rating failed. Try again.
Request failed. Try again.
We will promote constructive and witty comments to the top, so everyone sees them!
Sorry, we can’t load comments right now. Try again.