Universe

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Across
  1. 4. a body that orbits a planet
  2. 5. a body that orbits the star
  3. 7. a cluster of galaxies
  4. 8. a sphere of gas
  5. 9. a system of stars
Down
  1. 1. completely empty space
  2. 2. everything in existence
  3. 3. a collection of galaxies
  4. 6. a group of planets