Across
- 3. Something that uses Earth as the reference point
- 4. All planets are kept in orbit because of this force
- 6. A rocky or metallic object that orbits the Sun and is much smaller than a planet
- 9. Sun centered
- 11. A force of attraction between objects due to their masses
- 12. The path that a body follows as it travels around another body in space
Down
- 1. States that gravitational force increases as the mass of an object increases or the distance between two objects decreases
- 2. The envelope of gases surrounding the Earth or another planet
- 5. A celestial body similar to a planet but orbiting in a zone that has many other objects in it
- 7. One of the highly dense planets nearest to the Sun: Mercury, Venus, Earth, Mars
- 8. An object made of rock, ice, dust, and gas that revolves around the Sun
- 10. The inward force required to keep a particle or object moving in a circular path