Exploration Galaxies

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Across
  1. 2. Oval shaped
  2. 3. A system of millions or billions of stars
  3. 5. Broad band of light that can be seen in the night sky
  4. 8. Collection of planets
  5. 9. No particular shape
  6. 10. The star Earth orbits
Down
  1. 1. Center of Milky Way
  2. 4. A unit of astronomical distance
  3. 6. Has arms
  4. 7. includes all of space