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Across
  1. 2. a large, round object that revolves around a star and has cleared the region around its orbit
  2. 3. an imaginary line around which an object spins
  3. 4. an explosive eruption of waves and particals into space
  4. 8. a group of stars that forms a pattern
  5. 9. the path an object takes as it revolves around a star, planet, or moon
Down
  1. 1. one full orbit around the sun
  2. 3. a rocky mass up to several hundred kilometers wide that revolves around the sun
  3. 5. one whole spin of an object on its axis
  4. 6. any of the 4 planets in our solar system beyond Mars
  5. 7. a natural object that revolves around a planet