Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN: 9780134746241
Author: Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher: PEARSON
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Question
Why do we observe retrograde motion in some outer or
superior planets?
Because Earth is moving faster than the outer planets and
when Earth passes the planet, the planet appears to be
moving backwards.
Because the planets are moving in epicycle, sometimes the
planets are moving backwards relative to Earth.
Because Earth is moving slower than the outer planets and
when Earth passes the planet, the planet appears to be
moving backwards.
Because the Earth is moving in epicycle, sometimes the
other planets are moving backwards relative to Earth.
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Transcribed Image Text:Why do we observe retrograde motion in some outer or superior planets? Because Earth is moving faster than the outer planets and when Earth passes the planet, the planet appears to be moving backwards. Because the planets are moving in epicycle, sometimes the planets are moving backwards relative to Earth. Because Earth is moving slower than the outer planets and when Earth passes the planet, the planet appears to be moving backwards. Because the Earth is moving in epicycle, sometimes the other planets are moving backwards relative to Earth.
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