Across
- 2. a mechanism that uses an axel and wheel system
- 8. being aware and alert
- 9. the existence beyond the normal level
- 10. the study of life in the universe/space
- 12. the state of hesitation and concern
- 14. something originated from outside Earth
- 15. to transform the atmosphere of another planet, so it possesses Earth's characteristics
Down
- 1. the release of light from an insect
- 3. something among the stars
- 4. a submarine which can be big or small
- 5. something that is covered in wool or fluff
- 6. relating to hot water
- 7. a messenger and transporter
- 11. something being caused by gravity
- 13. a layer of the Earth's atmosphere, below the exosphere and above the mesosphere