Inner planets

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Across
  1. 7. the layers of gases surrounding a planet or other celestial body.
  2. 8. mercury, mars, earth, and Venus
  3. 10. of, on, or relating to the earth.
Down
  1. 1. the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.
  2. 2. a planetary-mass object that formed a differentiated rocky body, making it a satellite planet under the geophysical definitions of the term.
  3. 3. the red planet
  4. 4. shines very brightly
  5. 5. moves quickly across the sky
  6. 6. a celestial body moving in an elliptical orbit around a star
  7. 9. 3rd inner planet