Across
- 2. layers of gas that surround a planet
- 4. a large, circular pit in the surface of a planet or other body in space
- 7. a large circular mass that revolves around a star
- 8. a change in velocity
- 9. a force that exists between any two objects that have mass
- 10. the energy an object has due to its motion
- 12. the amount of matter in an object
Down
- 1. a pull or push that is applied to an object
- 3. the speed and direction of moving objects
- 5. a small object made of rock
- 6. a streak of light in the sky that forms when a piece of rock from space burns up in Earth's atmosphere
- 11. a body of ice and dust that travels in a long narrow orbit around the sun