Stars CW Puzzle Fitz

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Across
  1. 5. the most abundant gas in young stars
  2. 6. magnitude that explains how bright a star appears from Earth
  3. 9. the object from which a star can form if the temperatures get high enough
  4. 11. cloud of gas and dust in space in which a star can form
  5. 12. fusion process that converts nuclear energy into heat and light
  6. 13. the color of the hottest stars
  7. 15. category of extremely large, cool stars that form as massive stars die
  8. 16. magnitude that explains how bright a star actually is
  9. 17. forms when the nuclei of hydrogen atoms fuse together in the star's core
  10. 18. class of large, cool stars that are running out of hydrogen
Down
  1. 1. force that holds a star together
  2. 2. class of stars that contain most known stars including our own Sun
  3. 3. this category of star is emitting the last of its energy; what the sun will become as it dies
  4. 4. the color of a star is determined by its _______
  5. 7. the ionized gas that stars are made of
  6. 8. the brightness of an object
  7. 10. the color of the coolest stars
  8. 14. fundamental force that fuels a star