Across
- 3. Man who successfully used the method of stellar parallax to to calculate the distance to 61 Cygni
- 6. Man that discovered a planet and named it Ceres
- 8. Man who launched first rocket in 1929
- 9. Construction of this began in 1988
- 11. The artificial Space satellite that was launched in 1957
- 12. The person who developed the laws of planetary motion
- 16. This astronomer developed the theory of universal gravitation
- 18. Created the earliest description of the workings of the Solar System
- 19. Union founded in 1919
- 22. Calculated that 2 separate comets recorded at 76-year intervals were the same
- 23. Gagarin First person to orbit Earth
- 25. He was an ancient Greek astronomer who proposed a heliocentric model
- 26. Armstrong First man to step on the Moon
- 27. What number planet was discovered in 1930?
Down
- 1. This civilization created many new devices for observing the sky
- 2. An early model of the solar system that placed the sun in the center
- 4. An early model of the solar system with Earth at the center
- 5. Lost the bridge of his nose in a sword fight over an argument
- 7. The space telescope launched in 1990
- 10. In 1973, the U.S. launched
- 13. Discovered the planet Uranus in 1781
- 14. 1 In 1975, what did the United States launch?
- 15. This person created the celestial sphere
- 17. Organization established in 1958
- 20. Planet that was discovered in 1846
- 21. The first person to use a telescope to observe the sky
- 24. The name of the first space shuttle