Respuesta :
An outer planet exhibits a retrograde motion when the earth passes it in its orbit and catches a slow, active outer planet.
A change in the planet's apparent motion through the sky is referred to as retrograde motion. It is not REAL since the planet doesn't actually begin to orbit backward. Because of how the planet and Earth are orbiting the Sun and their respective positions, it only seems to do so. In astronomy, retrograde motion refers to a body's actual or apparent motion in the opposite direction from the (direct) motions of the majority of solar system components or other celestial systems having a preferred direction of motion. The outer planets Jupiter, Saturn, Mars, Uranus, Neptune, and Pluto move backward for two to six months of the year. The duration of the retrogradation increases with the distance from the planet. The illusion of retrograde motion is caused by the velocity of the observer on Earth.
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