Challenge it: Space!

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Across
  1. 3. everything that exists anywhere
  2. 5. a spiral galaxy with a central bar-shaped structure composed of stars
  3. 6. a collection of star systems
  4. 8. two galaxy’s combined to make one
  5. 9. a celestial body that is in orbit around the Sun
  6. 10. a group of planets and other bodies that revolve around a star
Down
  1. 1. no specific shape
  2. 2. the galaxy containing the solar system
  3. 4. a cloud of gas and dust in outer space
  4. 7. 4-5 main arms