Space!

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Across
  1. 2. a smaller body that revolves around a planet
  2. 3. any of the heavenly bodies except planets which are visible at night and look like fixed points of light
  3. 5. any one of the very large groups of stars that make up the universe
  4. 8. A person trained to travel in a spacecraft.
  5. 9. any large heavenly body that orbits a star (as the sun)
Down
  1. 1. a small bright heavenly body that develops a cloudy tail as it moves in an orbit around the sun
  2. 3. the sun and the planets, asteroids, comets, and meteors that revolve around it
  3. 4. a heavenly body with such strong gravity that light cannot escape it and that is thought to be caused by the collapse of a massive star
  4. 6. A push or pull on an object when it interacts with another.
  5. 7. the heavenly body in our solar system whose light makes our day and around which the planets revolve