Do All Planets Have Retrograde Motion. In addition to the stars, the sun, and the moon, there are several other objects in the sky which are easily visible at night. The motion of the planets.
The retrograde motion of the planets is an optical illusion, which is caused by planets orbiting the sun at different speeds to the earth. The apparent backward motion of the planets is caused by the relative motion of the earth and the other planets as they all go around the sun.