Across
- 3. when on object goes around another object
- 6. the collection of stars and planets that surrounds the sun which is in the center
- 8. the name of our galaxy
Down
- 1. the force of attraction between any 2 objects
- 2. the path planets and moons take as they revolve
- 4. the amount of space between 2 objects
- 5. the celestial objects that orbit the sun
- 7. the amount of matter in a space