Across
- 2. oxygen decreasing
- 4. an illusion of speed
- 8. an explosion from the sun
- 9. a curved path of a celestial body
- 11. All existing matter and space considered as a whole; the cosmos.
- 12. a way to store water
- 14. a way to communicate in space
- 16. what we breathe
- 17. an physical activity done outside the shuttle
- 18. a unidentified object in space
- 19. a vehicle used for traveling in space
Down
- 1. a force that attracts you to the earth
- 3. x-ray
- 5. a space laboratory
- 6. an artificial body placed to orbit a planet for data
- 7. Co2
- 10. no gravity
- 13. an envelope of gases surrounding the earth
- 15. a person who is trained to travel in a spacecraft
- 17. a transportation to outer space