Across
- 2. amount of matter in an object
- 4. the amount of gravitational pull on an object
- 5. a cloud of star dust that can form new stars and planets
- 6. what we call a place with so little gravity that things will float through the air
- 9. the pull of one object to another
Down
- 1. law that explains universal gravity
- 3. a layer of gas surrounding a planet held in place by gravity
- 5. scientist who found the law of conservation of energy
- 7. the path of planets going around a sun
- 8. a all of flaming gas pulled together by gravity