Official 21 Lec 1
Question 4 of 6
Why does the professor discuss the epicycle theory?

A.

To explain why early astronomers started measuring the velocity of the planets.

B.

To explain why the astronomer Aristarchus rejected the geocentric model.

C.

To show how early astronomers explained the apparent backward motion of some planets.

D.

To show that early astronomers believed that all planets moved in their own orbits around the sun.

正确答案:C

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