Across
- 2. Earth's twin
- 4. relating to Earth
- 6. first four planets when ordered by distance from sun
- 7. celestial body that orbits around a planet
- 8. outer layer of a planet made of nonmetal elements
Down
- 1. compacted substance-wise
- 3. last four planets when ordered by distance from sun
- 5. how far something is to something else
- 9. move around something repeatedly
- 10. gases formed around a planet