Across
- 2. system The collection of planets and their moons, in orbit around a sun.
- 4. A giant star in the middle of our solar system.
- 7. A fixed luminous point in space.
- 8. A piece of rock or metal that has fallen to the earth's surface from space as a meteor.
- 10. A celestial body moving in an elliptical orbit around a star.
- 12. A small rocky body orbiting the sun.
Down
- 1. The natural satellite of a planet.
- 2. A spot or patch that appears from time to time on the sun's surface.
- 3. year A unit of astronomical distance.
- 4. An artificial body placed in orbit around a body in space for research purposes.
- 5. An object consisting of a nucleus of ice and dust.
- 6. A small body of matter from outer space that enters the earth's atmosphere.
- 9. The curved path of a celestial object or spacecraft round a star, planet, or moon.
- 11. A system of millions or billions of stars.