Across
- 2. the force that pulls a smaller object towards a larger object
- 4. what something is made of
- 8. the four planets closest to the sun
- 9. celestial object that orbits around a planet
- 10. planets that are on the outside of the solarsystem
Down
- 1. the opposite of thin
- 3. again and again
- 5. moves around a planet
- 6. earth-like planets
- 7. the layer of gasses that surround a planet
- 11. the opposite of thick