Why does retrograde motion of the planets happen?
A) Mars follows an orbital path with occasional loops in it.
B) Every planet farther from the Sun that the Earth orbits faster than Earth.
C) Earth's rotation rate changes as the force of gravity from the Sun varies.
D) The planets speed up and slow down at random times during their orbit.
E) When Earth overtakes a planet in its orbit, the planet will appear to move backwards for a short time
Ans: E) When Earth overtakes a planet in its orbit, the planet will appear to move backwards for a short time
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