universe item catalog

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Across
  1. 3. a planet that is not in our solar system
  2. 5. when a white dwarf runs out of fuel entirely
  3. 6. a huge explosion of a massive star
  4. 8. a ball of ice and dust that revolves around a star and has a "tail"
  5. 9. this substance makes up 90% of the universe
  6. 11. a big ball of light hot enough for fusion of hydrogen
  7. 12. when a star's core starts to run out of fuel
  8. 13. when a star's outer layer comes off
  9. 14. a highly dense star made entirely of neutrons
  10. 17. when a star first starts to form
  11. 18. the left over remains of the creation of a solar system
  12. 19. a starlike object that does not have enough mass for fusion
  13. 20. the distance light travels in a year
  14. 22. the remains of a supernova
Down
  1. 1. a satellite of a planet
  2. 2. this is the very first stage of a star's life
  3. 4. this is so massive that it creates a hole in space-time
  4. 7. 3.6 light-years
  5. 10. when a star expands, it becomes this
  6. 15. when a massive star expands it becomes this
  7. 16. a satellite of a star
  8. 21. a cluster of stars