Across
- 6. Unit equal to average distance between the earth and the sun
- 7. Half the length of the shortest diameter
- 10. Surrounding the Earth or other planets
- 14. An artificial body placed in orbit used to collect information
- 15. Curve shaped flattened circle
- 16. Curved path of a celestial object
- 17. Point of light
Down
- 1. Constant connecting the gravitational force between two bodies
- 2. Measure of a curve
- 3. Point of orbit closest to the sun
- 4. Circular movement of an object around central point
- 5. Imaginary line where a body rotates
- 8. Movement of a celestial body around another
- 9. Relating to the movement of gravity
- 11. Point farthest from the sun
- 12. Path an object follows moving through space
- 13. Duration of one complete cycle
- 18. Defines size of an ellipse