Universe

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Across
  1. 2. the force that pulls everything toward the Earth
  2. 4. large holes in the ground, caused by something large hitting them
  3. 5. not like anyone or anything else
  4. 6. the planet third in order of the distance from the Sun, between Venus and Mars
Down
  1. 1. how far it is from one place to another place
  2. 3. the path of a planet or an object that is moving around another thing in space
  3. 4. the center part of an object