space

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