Across
- 2. space rock
- 5. the collection of eight planets and their moons in orbit round the sun
- 9. a celestial object consisting of a nucleus of ice and dust
- 10. Neil Armstrong was the first one there
- 11. unit of astronomical distance equivalent to the distance that light travels in one year
Down
- 1. an artificial body placed in orbit round the earth or moon or another planet
- 3. path of a planet
- 4. a system of billions of stars
- 5. a fixed luminous point in the night sky which is a large, remote incandescent body
- 6. a spot or patch that appears from time to time on the sun's surface
- 7. a piece of rock or metal that has fallen to the earth's surface from outer space
- 8. a small body of matter from outer space that enters the earth's atmosphere