space

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