Across
- 5. rotates around an axis or center
- 7. Zone not to hot and not to cold so liquid water can exist on a planet
- 9. rocky material that orbits the sun
- 12. attractive force between objects that have mass
- 13. organism that exists in an extreme environment
- 14. enters earth atmosphere and produces a streak of light
- 16. made of rock, ice and gas material that orbits the sun
Down
- 1. Mercury,Venus,Earth,Mars
- 2. object naturally object that exists in space and is observed by astronomers
- 3. tendency of an object in motion to resist change
- 4. belt small celestial body beyond neptunes orbit
- 6. Saturn,Jupiter,Neptune,Uranus
- 8. body orbiting a planet
- 10. The sun together with a group of celestial bodies
- 11. an object moving around another object
- 15. how hard it is to stop a moving object