Across
- 5. artificial body that orbits and collects data
- 7. the studies beyond earth's atmosphere
- 8. instrument used for viewing far objects in space
- 9. a mixture of gases that surround earth
- 10. a force that tries to pull 2 objects together
Down
- 1. space rock that has entered earth's atmosphere
- 2. a system of stars, gas and dust held by gravity
- 3. the scientific study of the universe as a whole
- 4. a group of stars forming a pattern
- 6. a person who is trained to travel in spaceship