Stellar evolution

12 questions

1. What is a star?
2. What happens in a nuclear fusion reaction?
3. What is a region of space called that contains traces of hydrogen gas and very fine dust?
4. What is a protostar?
5. What type of nuclei (which element) is fused together in nuclear reactions in the core of a new star?
6. What type of star fuses hydrogen in its core?
7. What is the main type of nuclear reaction that takes place in the core of a star?
8. How long are very large stars **main sequence stars** for, compared to average-sized stars?
9. What causes a star to expand into a red giant star?
10. What type of star forms from the core of a red giant star after its outer layers have been lost?
11. What happens to the outer layers of a red supergiant star?
12. What can form from the core of a red supergiant star after its outer layers have been lost in a **supernova** explosion?

License: OGL