2. A natural or artificial body that revolves around a planet.

3. A collection of stars, dust, and gas held together by gravity.

4. The force that attracts objects toward the center of the Earth.

5. A person trained to travel and perform tasks in space.

6. A celestial body moving in an elliptical orbit around a star.

7. A small rocky body that enters the Earth’s atmosphere.

8. A group of stars forming a recognizable pattern.

9. A celestial body consisting of a nucleus of ice and dust.

10. The curved path of an object around a star, planet, or moon.