Newton discovered that gravity affects the orbits of planets true or false

The correct answer is False.

Explanation:

Newton was inspired by Kepler's theory to be able to establish his theory about gravity, which is defined as a force that occurs only when there are two bodies with mass. Newton does not give a clear explanation why this situation occurs, since he calls this force as divine, and does not go further in the study of it.

The planets to be solid bodies with mass fall within this dynamics, being so close or gravitating in orbits of planets with greater mass that could cause an affectation of both planets.