Across
- 3. the defined force of attraction between two objects
- 4. ball of heat
- 8. the answer to the question
- 9. the thing that holds everything in space
- 10. a ring of rocky objects between Mars and jupiter
- 12. bowls-shaped marks made by impacts
- 13. states that any two objects exert gravitational attraction on eachother
- 14. the planets closer to the sun
- 16. a giant cosmic cloud of dust and gas where new stars are born
- 17. describes the motion of planets
Down
- 1. the part of space with nothing in it
- 2. sun centered
- 5. causes the planets to move in a straight line
- 6. earth centered
- 7. the gas giants
- 11. smaller than planets
- 15. cloud of gas and dust