Across
- 2. total amount of matter
- 3. drawn using string,pencil and two thumbtacks
- 4. a tendency to do nothing or to remain unchanged
- 7. sun's inward pull of gravity on a planet
- 10. 4 moons of Jupiter
- 11. two bodies with equal masses under the influence of their mutual gravity
- 12. considered a dwarf planet in our solar system
- 14. earth is not the center of the universe
Down
- 1. discovered the aberration of starlight
- 5. semimajor axis of earth's orbit around the sun
- 6. also called Tycho he studied astrology, alchemy, and medicine
- 8. force of gravity
- 9. discovered the law of gravity
- 10. Italian philosopher created the telescope
- 13. earth ray at center of universe