Life Cycle of Stars

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Across
  1. 3. medium-mass star will live for about ___ billion years
  2. 6. Once medium-sized stars run out of nuclear fuel, the star becomes a
  3. 7. These stars have no fuel, but glow from leftover energy
  4. 9. A star that is more massive than the sun may live only about ten _____ years
  5. 12. The earliest stage of a star's life in which the contracting cloud heats up and becomes this
  6. 13. The explosion of a large star that causes heavier elements to form
  7. 15. forms from the outer layers of hydrogen and helium that are cast off when a red giant becomes a white dwarf
  8. 16. The stars heats up and hydrogen is converted to helium
  9. 17. Stars that have less mass then the sun can live up to ____ billion years
  10. 18. These stars are rich in hydrogen
  11. 19. How long a star lives depends on its
Down
  1. 1. These stars form from small supergiants
  2. 2. The brightness of a star's light is called
  3. 4. A place in space where gravity is so great that light can't escape
  4. 5. Huge cold clouds of gas and dust
  5. 8. When a massive star runs out of hydrogen, it turns into this type of star
  6. 9. Stars spend most of their lives here as long as hydrogen fuses into helium
  7. 10. The most massive stars form ____ in their core
  8. 11. These stars use up their fuel more quickly
  9. 14. A white dwarf that has cooled