What Determines the Evolutionary Path of Stars?

[nath_quam]

Hey, would anyone be able to tell me quality websites/ or help to answer the following questions:
1. What is a star?
2. How Astronomers can tell the difference between different stellar objects?
3. What powers a star?
4. The evelotionary path of a star and it's different stages.
5. Why Stars move though this evolutionary cycle and why the cycle is altered for stars of different mass?

Thanks for your help Nath

 

[Farsight]

There's lots of good websites, nath. Do a google search on "Stellar Evolution" and you see things like this from Nasa.

http://observe.arc.nasa.gov/nasa/space/stellardeath/stellardeath_intro.html