Across
- 3. The amount of matter in an object
- 4. A huge group of single stars, star systems, dust, and gas bound by gravity
- 7. When the only force acting on an object is gravity
- 12. The curved path of a celestial object around a star or planet
- 13. The rate at which velocity changes (9.8 m/s² on Earth)
- 14. all of space and everything in it
- 15. How much mass is contained in a given volume
Down
- 1. An object that orbits a planet
- 2. As this increases, the gravitational pull between two objects decreases
- 5. The natural pull between two objects
- 6. An object whose gravity is so strong that even light cannot escape
- 8. The measure of the force of gravity on an object
- 9. The force that pulls objects toward each other
- 10. The scientist who formulated the law of universal gravitation
- 11. The rise and fall of sea levels caused by the moon's gravity