Newton
Newton discovered this with his Universal Theory of Gravity.
A: Issac Newton
Nicolaus Copernicus discovered why planets stay in orbit when he found that the planets revolve around the sun. He is credited with starting the Scientific Revolution through this discovery.
The gravity of the Sun keeps the planets in their orbits. They stay in their orbits because there is no other force in the Solar System which can stop them.
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The forces of gravity between two masses are the cause of all orbits.
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The force of gravity between the planets and the sun is what keeps the planets in their orbits. Gravity pulls the planets towards the sun, but their forward velocity keeps them moving in a circular or elliptical path around it. This balance between gravity and velocity enables the planets to stay in their orbits around the sun.
The planets and other objects in the solar system stay in their orbits due to the mutual gravitational attraction between each orbiting object and the Sun.
Sir Isac Newton was the scientist who discovered why the planets stay in orbit.
because of the gravity the sun has and also the planets have gravity turning around the sun