Across
- 2. a large celestial body that is composed of gas and emits light
- 3. The spinning motion of a planet on its axis
- 6. any natural object outside earth's atmosphere
- 7. A meteoroid that has hit earth's surface.
- 8. imaginary line that passes through the center of an object
- 9. A ball of frozen dust and rock that orbits the sun and has a tail that glows
- 10. a small object made of rock or metal that orbits the sun
- 11. Millions or billions of stars held together in a group by their own gravity
- 12. The study of the moon, planets, stars, and other objects in space
Down
- 1. A large body in space that orbits a star and does not produce light of its own
- 3. The movement of an object around another object
- 4. A device built to observe distant objects by making them appear closer
- 5. star, planets, and all the other celestial bodies that revolve around the star
- 11. A force of attraction between objects that is due to their masses