Across
- 2. The force of attraction between all masses in the universe.
- 5. How many planets are in the solar system
- 6. The science of celestial bodies.
- 8. Planets made of silicate, rock, water, and/or carbon
- 10. When you can see the whole moon.
- 11. What galaxy are we in?
- 12. The only planet that can sustain life.
- 13. The second planet from the sun.
Down
- 1. Too small to be a planet.
- 2. Large planet composed of gas.
- 3. How many moons does Mars have?
- 4. How many rings does Uranus have?
- 6. The science of the movements of and relative positions of celestial bodies.
- 7. How long is one day on Earth?
- 9. The star at the center of the universe.