Ring Nebula Astronomy?

[Netherlord]

I have a write up on the Ring Nebula to do.
I need to answer the questions:
What is it?
How did it form?
How long will it last?
Is it visibly changing in anyway?

Can someone give me some sources where I may get this information?

 

[Geoff G]

Wikipedia is your friend:
http://en.wikipedia.org/wiki/Ring_nebula

 

[Mark]

It was Created by God