space

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Across
  1. 5. orbits the earth
  2. 8. the zone where life can happen
  3. 9. the center of our solar system
  4. 10. a group of billions of solarsystem
Down
  1. 1. a factor of gravity
  2. 2. balls of rock that orbit the sun
  3. 3. another factor of gravity
  4. 4. the force that pulls objects together
  5. 6. happens when a star explodes
  6. 7. the amount of matter a object contains