space

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