Across
- 1. one complete orbit around another object
- 3. an object that orbits the Sun made of frozen water and dust
- 5. the force of gravity at the surface of the Earth or other celestial body
- 10. zone of weak gravity
- 14. amount of matter in an object
- 15. a rocket-launched spacecraft, able to land like an unpowered aircraft
- 16. force of attraction between two objects due to their masses
- 17. an artificial body placed in orbit around the earth or moon
Down
- 1. a cylindrical projectile that can be propelled to a great height or distance
- 2. a large artificial satellite used as a long-term base for manned operations in space.
- 4. the path that one object in space follows as it revolves around another object in space.
- 6. the spinning of an object on its axis
- 7. rocky planet, composed primarily of silicate rocks or metals
- 8. an unmanned exploratory spacecraft designed to transmit information about its environment
- 9. force exerted on an object by gravity
- 11. The measurement of forces acting on an object and are in the form of a push or pull.
- 12. a small, rocky body that orbits the Sun
- 13. A gravitationally bound system of the Sun and the objects that orbit it
- 14. a small piece of matter from outer space