Galaxies

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Across
  1. 6. Unit of space measurement
  2. 7. Central bulge, long arms
  3. 8. Galaxy we live in
  4. 9. Someone who studies the universe
Down
  1. 1. Holds galaxies together
  2. 2. No defined shape
  3. 3. Referring to galaxies
  4. 4. Holds gas, stars, and solar systems
  5. 5. Round, densely packed
  6. 7. Holds planets and a star