Across
- 2. a collection of billions of stars
- 5. a belt of asteroids that orbit the sun
- 6. huge spheres of burning gas
- 7. a region in space that has such an enormous force of gravity that light can not escape
- 9. the distance that light would travel in a full year
- 10. the layers of gases that surround many planets and other bodies
- 11. a description of a direction
Down
- 1. a measurement of time
- 3. pieces of rock or metal that orbit around the sun
- 4. a group of stars which appear to form a pattern or picture in the night sky
- 5. study of stars
- 8. a person who travels and works in space