Space Crossword Puzzle: Extra Credit

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Across
  1. 2. a natural object that revolves around a planet
  2. 5. an imaginary line around which an object spins
  3. 7. one full orbit of an object around another object
  4. 8. an explosive eruption of waves and particles into space
  5. 9. a large, round object that revolves around the sun but has not cleared the region around its orbit
  6. 11. any of the four closest planets to the sun
  7. 13. one whole spin of an object on its axis
Down
  1. 1. a group of stars that forms a pattern
  2. 3. any of the four planets in our solar system beyond Mars
  3. 4. a large, round object that revolves around a start and has cleared the region around its orbit
  4. 6. a frozen mass of different types of ice and dust orbiting the sun
  5. 10. a spacecraft that gathers data without a crew
  6. 12. the path an object takes as it revolves around a star, planet, or moon
  7. 14. a rocky mass up to several hundred kilometers wide that revolves around the sun