Space

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Across
  1. 4. A type of galaxy
  2. 7. Cloud of interstellar gases and dust
  3. 11. Between star clusters
  4. 12. Occurring between stars
Down
  1. 1. Unit of interstellar distance
  2. 2. Object in orbit around a planet
  3. 3. Branch of astronomy dealing with objects outside the Milky Way
  4. 5. Star cluster
  5. 6. Darkest of Uranus' largest moons
  6. 8. From the Latin meaning "dawn"
  7. 9. A region of spacetime where gravity is so strong that nothing can escape from it (2 words)
  8. 10. Empty space