What Causes the Apparent Retrograde Motion of the Planets

question 112

Multiple Choice

What causes the apparent retrograde motion of the planets?

• A) As Earth passes another planet, its gravitational pull slows down the other planet so that it appears to be traveling backward.
• B) When planets are farther from the Sun, they move slower than when they are nearer the Sun; it is during this slower period that they appear to move backwards.
• C) The other planets never really appear to move backward; the background stars shift due to Earth's revolution around the Sun.
• D) As Earth passes another planet, the other planet appears to move backward with respect to the background stars, but the planet's motion does not really change.
• E) Apparent retrograde motion is an illusion created by turbulence in Earth's atmosphere.

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Definitions:

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