Across
- 3. the element that is the main source of fuel for main sequence stars
- 5. what a white dwarf will become after it no longer gives off light; scientists say that the universe isn't old enough for these to form yet
- 6. a small, dense star made of of neutrons; what the leftovers of a supermassive star can turn into
- 7. a stellar explosion that can occur after the core of a massive star collapses
- 9. this element is known as the "star killer" because it cannot fuse with something else to create energy
- 10. the leftover core of a smaller star after its red giant phase
- 11. this is the element that is created when hydrogen undergoes fusion
- 12. stars that burn hydrogen fuel in their cores and are relatively stable; most stars, including our sun, are in this group
Down
- 1. an early stage in a star's life where fusion begins
- 2. a large star that has expanded and cooled after it has burned the hydrogen fuel in its core; the next stage our sun will become
- 4. a large cloud of gas that is created when
- 5. an area of space that has such a strong gravitational field that no matter or even light can escape
- 8. outer layers of a red giant drift off into space
- 13. cloud of dust and gas in space that are star nurseries