Across
- 4. soviet space station
- 5. newton's book that suggested space travel
- 7. Found Uranus
- 9. very energetic stellar explosion
- 11. space telescope in the X ray region
- 12. material to build space elevator that is stronger than kevlar
- 13. number of people that set foot on moon
- 14. gave the helio-centric model
- 15. space telesope in optical range
- 16. age of the universe
Down
- 1. prize to promote space tourism
- 2. place where most comets exist in the solar system
- 3. first spacecraft to escape sun's gravity
- 6. law that predicts the temperature of the sun
- 8. Telstar is the first ------- satellite to be put into orbit
- 10. 11.2 m/s