Across
- 4. a moon, planet or machine that orbits a planet or star
- 5. one rotation around Earth's axis
- 7. an invisible line around which an object rotates, or spins
- 8. one of Earth's orbit around the sun
- 9. the location of an object at a given time
- 11. an object that orbits a planet or something else that is not a star
- 13. planet that is the third in order from the sun
Down
- 1. a period of the year that is distinguished by special climate conditions, determined by the location of Earth in it's orbit
- 2. the circular motion of an object around its center
- 3. the force that pulls objects to Earth's surface
- 6. circular depression in the surface of a planet
- 7. the layers of gases surrounding a planet
- 10. the star at the center of our solar system
- 12. a regular, repeating path that one object takes around another object or center of gravity