Stars Crossword

3. hydrogen combines to form helium and energy in a main ___ star
5. the end of massive stars' lives where density is so great that protons and electrons merge to become a different subatomic particle
7. the end of the most massive stars' life where the object is so dense not even light can escape
8. the final two stages of a low mass star is white and black this
12. massive main sequence stars become this when they run out of hydrogen
13. cloud of gas and dust in space

1. an explosion of a massive star when fusion stops and it collapses on itself
2. a massive star will explode when this element is produced
4. low mass main sequence stars become this when they run out of hydrogen (H)
6. the type of nebula that forms after a giant stops fusing
9. the process where the atoms of an element combine to make new elements and energy
10. elements that form in a supernova explosion are known as the ___ elements
11. the element formed when hydrogen fuses