Across
- 5. the force that keeps planets in orbit around stars
- 6. when a planet is closest to its star
- 9. this planet takes 163.7 years to orbit the sun
- 10. earth spins on its axis
- 12. when a planet is furthest from its star
Down
- 1. the measure of how elliptical a shape is
- 2. earth moves around the sun
- 3. another word for when planets revolve around a star
- 4. a day on this planet is 9 hours 50 minutes and 30 seconds long
- 7. the not-quite-circular shape planets take as they orbit around stars
- 8. a scientist who had 3 laws about orbits, eccentricity and gravity
- 11. earth’s is tilted at an angle of 23.5 degrees