Across
- 2. imaginary rotation line of Earth
- 5. about one fourth the diameter of Earth
- 6. the moon revolves around this planet
- 7. the widest point across the equator
- 8. 108 Earths can fit across its diameter
- 10. the organization of our solar system
- 13. gather light so we can see dim objects
- 14. receive electromagnetic waves
Down
- 1. time it takes for Earth to rotate once
- 3. Identify elements on stars using light
- 4. ground-based robots
- 5. one revolution of the moon around Earth
- 9. one revolution of Earth around the sun
- 11. Earth's journey around the sun
- 12. man-made ones orbit other planets