space

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Across
  1. 3. an event at the end of a supergiant stars life, which can shine brighter than the galaxy
  2. 6. multiple galaxies
  3. 9. a tiny planet, smaller than 3000km in diameter
  4. 11. planets with a surface
  5. 14. most planets are in this
  6. 17. an immensely big star
  7. 18. a small star
  8. 20. multiple galaxy clusters
Down
  1. 1. a planet not in a solar system
  2. 2. an area in space with so much gravity that not even light can escape
  3. 4. a star with great gravity
  4. 5. planets made of gas
  5. 7. a large star
  6. 8. what we are made of
  7. 10. a really large star
  8. 12. the fastest thing in the universe
  9. 13. one of the smallest things in the universe
  10. 15. an extremely magnetic neutron star
  11. 16. everything
  12. 19. the main light source in the universe