Across
- 1. a large system of stars, gas, and dust held together by gravity
- 3. object made of ice, rock, dust, and gas that revolves around the sun
- 4. a division of the year into four periods marked by changes in the weather
- 5. an imaginary line about which a body rotates
- 7. the large gaseous planets with multiple moons and ring systems
- 9. one half of Earth
- 10. the motion of one object around another object
- 11. a mass of hot gases that produces its own light energy
- 12. a natural object that orbits a planet
Down
- 2. a unit of measure used to describe the distance in space
- 5. an object much smaller than a planet that orbits the sun
- 6. The small rocky planets having only a few moons
- 8. the spinning of an object on its axis