science and solution

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Across
  1. 3. The Earth will _____ around the sun.
  2. 4. is a force that pulls an object to Earth
  3. 6. A _____ is a group of stars that forms a symbol in space.
  4. 8. In the _____, you can see stars.
Down
  1. 1. In the _____, you can't see stars
  2. 2. is a constellation in space
  3. 5. The ______ is the only planet with life on it.
  4. 7. the closest star to Earth is the _____.