Which are features of Copernicus's model of the solar system? Select the three correct answers.

Question

Responses:

a) All planets orbit the Sun at the same speed.
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b) Earth is fixed to a crystalline sphere.

c) The planets move in perfect circles.

d) The outer planets move in epicycles.
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e) The stars are fixed to an outer sphere.

f) The Sun is at the center.

Answer 1

c) The planets move in perfect circles.
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e) The stars are fixed to an outer sphere.
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f) The Sun is at the center.