Across
- 1. the point at which rays of light meet after reflected
- 4. earths average distance from the sun
- 7. - objects ranging from 1 kilometer to 100s of km in diameter
- 9. furthest point from the sun in a planets orbit
- 11. the shape of a planet’s orbit
- 12. the backward movement of planets
Down
- 2. discovered the heliocentric theory
- 3. closest point to the sun in a planets orbit
- 5. - an oval shape that is centered on two points
- 6. discovered that sun was the center of the solar system
- 8. discovered gravity
- 10. discovered that orbit is elliptical