Stars and Galaxies

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Across
  1. 2. An explosion stage which can happen several times in a star's life
  2. 5. Type of star created from a dense ball of neutrons
  3. 9. Fixed patterns in the night sky
  4. 11. Neutron star with two beams of radiation
  5. 13. Type of constellation that is visible all year
  6. 15. The first stage of every star's life
  7. 16. The stage of a star's life before supernova
  8. 17. A galaxy with no defined shape
  9. 20. Expanding gasses surrounding an extremely hot core of a star
  10. 22. What exists in the center of a nebula just before a main-sequence star forms
  11. 23. The stage of a star's life before planetary nebula
  12. 25. The galaxy that we are in
Down
  1. 1. A cluster of stars usually found in the center of a galaxy
  2. 3. Star system with more than two stars that orbit each other
  3. 4. Makes up the difference between a giant and a supergiant
  4. 6. Type of galaxy with spiraling arms and a band of stars that runs through the center
  5. 7. A dead star in space whose gravity is so great, not even light can escape
  6. 8. A round of disk shaped galaxy
  7. 10. The kind of galaxy the Milky Way is
  8. 12. A cluster of stars usually found in the arms of a galaxy
  9. 14. This causes a nebula to contract
  10. 15. Type of reaction that occurs in the core of all main-sequence stars
  11. 18. Collection of gas, dust, nebulae, and stars
  12. 19. The force that causes pressure inside of stars
  13. 21. The stage of a star's life cycle that likely doesn't exist
  14. 24. Star system with exactly two stars that orbit each other