Across
- 1. Something that pushes or pulls
- 3. The tendency of a body at rest to remain at rest and a body in motion to stay in motion
- 5. Maker of the geocentric model
- 6. The relationship between the distance of planets from the sun and their orbital periods
- 8. Proposed the heliocentric model
- 10. Places the sun at the center with earth orbiting
- 13. A line from the sun to the planet sweeps out equal areas in equal times
- 14. The universal force that acts on all objects in the universe
- 15. The amount of matter an object contains
Down
- 2. Made the theory of relativity
- 4. Measured the circumference of the earth
- 7. Places the earth at the center of the universe
- 9. Nonuniform motion a change in speed either increasing or decreasing
- 11. Discovered the law of universal gravitation
- 12. Planets move in elliptical orbits with the sun at one focus of the elipse