Life Cycle of Stars

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Across
  1. 4. Contains all matter that has ever been created
  2. 7. Birthplace of stars, cloud of gas and dust
  3. 12. Massive explosion of a star
  4. 13. Massive star that has expanded and begins to cool down
  5. 14. Round or Oval shaped Galaxy
  6. 16. Star that has expanded and begins to cool down
  7. 19. Clump of gas and ice
  8. 20. Supermassive stars collapse into these, so dense light cannot escape
  9. 21. Swirl Shaped Galaxy
Down
  1. 1. Star that is stable and glows brightly
  2. 2. Our main sequence star
  3. 3. Space rock not between Mars and Jupiter
  4. 5. The route a star takes through its life cycle depends on its _____.
  5. 6. Galaxy with no shape; 'blob'
  6. 8. Highly dense, collapsed star, packed with neutrons
  7. 9. Terrestrial or gas sphere that orbits a star
  8. 10. Sphere of gas and dust that is hot and dense
  9. 11. Space rock in Earth's atmosphere
  10. 15. Space rock between Mars and Jupiter
  11. 17. Star that is beginning to form; gas and dust begin to spin
  12. 18. Space rock that strikes Earth's surface
  13. 22. Contains billions of stars, gas, and dust