Across
- 2. A space craft traveler
- 5. Involving chemistry
- 7. study of space
- 10. A spacecraft
- 11. two to one ratio of hydrogen and oxygen
- 12. A field of study involving the world
- 13. a layer that contains a gas/ gases
- 14. Something produced
- 15. living organism
Down
- 1. An American space agency
- 3. A universal force or phenomenon
- 4. Multiple planets that orbit a star
- 6. An object used to observe a diminutive object
- 8. Greek Root "remote"
- 9. Constant force