When viewing the planets,Mars appears to move backwards,or retrograde,because ________.
A)it is rotating around the sun slower than the earth's rotation
B)it is rotating around the sun faster than the earth's rotation
C)it is rotating at approximately the same speed but its orbit is more elliptical than the earth's rotation
D)it is rotating at approximately the same speed but its orbit is more circular than earth's orbit

Question

Quizplus · Accepted Answer

Mars appears to move backwards, or retrograde, because it orbits the Sun slower than Earth. As Earth overtakes Mars in its orbit, Mars appears to move backward against the background stars.

When Viewing the Planets,Mars Appears to Move Backwards,or Retrograde,because ________