Across
- 1. a system of many types of matter held together by gravity
- 6. the use of astronomy and space technology to research outer space
- 7. includes everything in outer space
- 8. a group of planets, meteors or other objects that orbit a large star
- 9. an imaginary boundary where the sky meets the ground or sea
Down
- 2. the study of space
- 3. a layer of the atmosphere of earth
- 4. the outermost part of the sun’s atmosphere
- 5. a vehicle used to travel in space