Across
- 1. the force of attraction that pulls bodies towards the center of the Earth
- 5. a mass of hot gases that produces its own light energy
- 6. object made of rock, ice, dust, and gas that revolves around the Sun
- 8. the part of the experiment that is changed on purpose to test its effects
- 9. the large, gaseous planets with multiple moon and ring systems a climate zone with very little precipitation and extremely cold temperatures
- 11. a solid material with its own properties, formed in or on the Earth's crust a natural object that orbits a planet
- 12. the factor that is being measured in the experiment
- 13. an imaginary line about which a body rotates
- 14. the Sun, planets, and objects that orbit the Sun
- 15. the spinning of an object on its axis
Down
- 1. a large system of stars, gas, and dust held together by gravity
- 2. an object much smaller than a planet that orbits the Sun
- 3. the small, rocky planets having a few moons
- 4. things that are held constant during an experiment
- 7. the motion of one object around another object
- 10. a medium-sized star at the center of our solar system