Stars

2. Massive stars can create heavier elements up to ________.
3. The fusion process begins in the _____ of a star, where temperatures and pressures are extremely high.
4. Cool, ___ stars have surface temperatures below 3,500 degrees Celsius.
10. Stars generate energy through a process called __________ _________.
11. Nuclear fusion is the joining or fusing together of ______ atomic nuclei to make heavier elements.
12. A star's ________ determines how bright it shines, how hot it is, and how long it will live.
13. The brightness of a star as seen from Earth depends on luminosity and ________.
15. As hydrogen atoms fuse, they create ________ atoms as the end product.

1. The smallest stars are about the size of a planet like ________.
3. As stars age, they begin to fuse helium into heavier elements like ______ and oxygen.
5. Hot, _____ stars have surface temperatures over 20,000 degrees Celsius.
6. Stars come in different ________, and this tells us how hot they are.
7. This fusion of hydrogen nuclei releases energy in the form of ________ and light.
8. The mass of a star determines how _________ it shines.
9. The ________ of a star is how much energy it gives off.
14. When massive stars die, they ________, creating and scattering elements heavier than iron throughout the universe.