Space and Matter

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Across
  1. 2. large group of stars and dust held together by gravity
  2. 4. All of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy
  3. 7. A collection of planets
  4. 8. representing the earth as the centre
  5. 11. Eight planet in the solar system
  6. 12. A huge spiral galaxy
Down
  1. 1. huge explosion in Universe
  2. 3. First person to step on Moon
  3. 5. model in which the Earth and planets revolve around the Sun at the center of the universe
  4. 6. the study of space and Matter
  5. 9. Gas Giant Planet in our solar system
  6. 10. Force that pulls an object toward earth