SPAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACE

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Across
  1. 4. one of the if not the smallest black hole
  2. 6. quiet weird
  3. 10. the coldest thing in the universe
  4. 11. the universes biggest thing
  5. 12. probably the worst holiday place
  6. 13. a giant in Greek mythology who was buried under Mount Etna
Down
  1. 1. the largest known black hole in the universe
  2. 2. thought to be the closest planet to the sun
  3. 3. known for having water
  4. 5. put a ring on it
  5. 7. the smallest named moon in the solar system
  6. 8. primordial black holes
  7. 9. approximately 4,300c (7,800f)