Across
- 2. how much matter is in something
- 7. scientist who studied why objects fall
- 8. that pulls objects towards each other
- 9. planet in our solar system
Down
- 1. is the planet we live on
- 3. objects in the solar system rotate around this
- 4. how much gravitational pull is on something
- 5. what rotates around the earth
- 6. closest planet to the sun