Across
- 1. is a gas giant and is named after the god of sea
- 3. is a terrestrial planet that we all live on
- 7. already in space
- 8. Another name for terrestrial planets
Down
- 2. F=G(M1xM2/(d)2)
- 4. things that are put into space
- 5. planets move in elliptical orbits with the Sun as a focus
- 6. made primarily of hydrogen and helium