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