Across
- 3. probe A spacecraft sent to collect data from space without humans onboard
- 5. The force that pulls objects toward each other
- 6. The central part of a planet, star, or other celestial body
- 8. The path an object follows around a planet, star, or moon
- 9. The distance across a circle or sphere through its center
- 10. shaped holes on a planet or moon caused by impacts
- 11. Being the only one of its kind
Down
- 1. The amount of space between two points
- 2. Anything that has mass and takes up space
- 4. A person who studies stars, planets, and other objects in space
- 7. The outside layer of an object