Crossword puzzle science

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Across
  1. 3. Closest planet to the sun
  2. 4. third closest planet to the sun
  3. 5. terrestrial planets closest to the sun
  4. 8. an object that orbits a planet
  5. 9. a celestial object that orbits a planet
  6. 10. a celestial body moving in an elliptical orbit around a star.
Down
  1. 1. second closest planet to the sun
  2. 2. the four inner planets
  3. 6. the layer of gasses around a planet
  4. 7. fourth closest planet to the sun