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. the main light source in the universe
  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