Across
- 2. a person who travels and works in space
- 9. the path one object takes around another
- 10. a ball of ice and rock with a bright tail
- 11. the layer of gases around a planet
- 14. the area beyond Earth’s sky
- 15. information collected for study
- 16. to look carefully for something
- 17. a talk where people share different ideas
- 18. a trip from one place to another
Down
- 1. a vehicle that travels in space
- 3. a large body that goes around a star
- 4. everything that exists in space
- 5. a life form from another planet
- 6. a vehicle that moves by pushing out gas
- 7. to share or exchange ideas
- 8. a group of planets and the star they move around
- 12. a place where astronauts live and work in orbit
- 13. a huge group of stars and planets together