Across
- 2. a giant cloud of gas and dust made of mostly hydrogen and helium
- 3. stars spend most of there lfe in this stage
- 5. same as red giants just bigger stars to star with.
- 7. when light waves ae being stretched.
- 11. the core shrinks as the outer layer of gas gets "puffed" away.
- 14. nebula stars to clump together through gravitym
- 15. most common galaxy with a bulge in the middle and then a disk of stars.
- 16. the element rich leftovers of a exploding star or planetary nebula.
Down
- 1. nuclear fusion starts and star collapses and then expands.
- 4. oval shaped galaxy with the gas and stars spaced out evenly but no bulge.
- 6. star shrinks until center becomes hot enought to fuse helium into carbon and grows 10X
- 8. core after planetary nebula.
- 9. are galaxys with no exact shape
- 10. forms from the most massive stars. Gravity so powerfull even light cant excape.
- 12. density with immensity and small to. forms after supernova.
- 13. happened 13.8 million years ago and was the start of the universe.