Unformatted text preview: 5. In Copernicus’ model, what causes retrograde motion? What do we even mean by “retrograde motion”? 6. Why is Copernicus’ work often referred to as the “Copernican Revolution” ? 7. State Kepler’s three laws. 8. What is the general shape of a planet’s orbit? 9. When does a planet move fastest in its orbit? Slowest? 10. Do the outer planets take more time or less time than the inner planets to complete an orbit around the Sun? 11. What was Galileo’s strongest proof that Copernicus was correct? 12. What did Galileo mean when he (reputedly) muttered “Eppur si muove” ? I don’t want just the literal translation… I want to know what he was referring to....
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- Spring '08
- Planet, Copernicus, retrograde motion, ancient Greek astronomers