Outer Space Crossword 57

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Across
  1. 5. This has a chance of creating antimatter
  2. 8. The hunter constellation
  3. 9. One thing a black hole emits
  4. 11. The Sun emits these
  5. 16. The closest star system to Earth
  6. 17. The closest star to Earth
  7. 18. A huge cloud of gas
  8. 19. If a supernova doesn't make a black hole, it can make this
Down
  1. 1. The highest-energy light
  2. 2. This infects other matter when it touches it
  3. 3. Jupiter, Saturn, Uranus, and Neptune are this type of planet
  4. 4. The known thing that can escape a black hole
  5. 6. The ring of icy objects and comets
  6. 7. The element that ultimately causes a star to die
  7. 10. Formerly known as Eta Argus
  8. 12. A technologically advanced civilization would have a high number on this scale
  9. 13. The hottest color of star
  10. 14. The type of planet PLuto is
  11. 15. The object at the center of a blackhole