Across
- 3. The star at the centre of our Solar System.
- 7. The eight planets and their moons in orbit round the sun, together with asteroids, meteoroids, and comets.
- 10. The natural satellite of the Earth.
- 13. An optical instrument used to observe space.
- 14. A piece of rock or metal that has fallen to the earth's surface from outer space.
- 15. A hollowed-out area produced by the impact of a meteorite.
Down
- 1. All existing matter and space considered as a whole; the cosmos.
- 2. A spherical celestial body made of hot gas that produces radiant energy.
- 4. A system of millions or billions of stars, together with gas and dust.
- 5. A small rocky body orbiting the Sun.
- 6. A person who is trained to travel in a spacecraft.
- 8. A vehicle used for travelling in space.
- 9. A person who observes celestial phenomena.
- 11. A celestial object consisting of a nucleus of ice and dust.
- 12. A room or building housing an astronomical telescope or other scientific equipment for the study of natural phenomena.