Changes in the predicted motion of Uranus led to the search for an eighth planet.

Name: Changes in the predicted motion of Uranus led to the search for an eighth planet.
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In the late 19th century, Uranus was not moving as predicted by mathematical models. This led to astronomers predicting the existence of an eighth planet, which was later confirmed to be Neptune. The observed deviations in the motion of Uranus led to the prediction and subsequent discovery of Neptune, the eighth planet from the Sun.

Changes in the Predicted Motion of Uranus Led to the Search