Stars and Galaxies

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Across
  1. 4. how long stars live is based on their _______
  2. 6. what can stars steal from each other
  3. 8. what is the key component of stars
  4. 10. baby stars are called
  5. 12. color of the hottest star
  6. 14. what are galaxies made of?
  7. 16. color of the coldest star
  8. 17. what do we have in common with stars?
  9. 18. when large stars die, what do they do?
  10. 19. reaches Earth's surface
  11. 20. brightness of star
  12. 21. tool that compares star's temperature and magnitude
  13. 22. our galaxy
Down
  1. 1. system of two stars bound by gravity
  2. 2. shape of star
  3. 3. brightest star in galaxy
  4. 5. type of galaxy with arms
  5. 7. pulls gas and dust together
  6. 9. a supernova is another word for a star ________
  7. 11. stars are ________ km away from Earth
  8. 13. the brightness of a star as seem from Earth
  9. 15. massive stars collapsing creates a __________
  10. 19. burns up before reaching Earth