Provide comprehensive answers to the following questions. Remember to support your arguments where necessary by websites and pictures.
1. Why did early Astronomers conclude that Earth had to be motionless?
2. How did the Ptolemaic model explain retrograde motion?
3. Why did Greek astronomers conclude that the heavens were made up of perfect crystalline spheres moving at constant speed?
4. In what way were the models of Ptolemy and Copernicus similar?
5. Why did Copernican hypothesis win gradual acceptance?
6. Explain how Kepler’s law contradict uniform circular motion?
7. How did Newton’s law lead you to conclude that gravitation has to be universal?
8. What are the two factors that depend on the orbital motion of the moon?
9. Galileo was condemned by inquisition, but Kepler, also a supporter of Copernicus was not. Why not?
10. What contributions did Johannes Kepler make to Astronomy?
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