How does gravity affect the motion of the planets in our solar system?

Gravity is the fundamental force that governs the motion of planets in our solar system. It is the gravitational pull from the Sun that keeps the planets in their elliptical orbits, preventing them from drifting away into space. Additionally, the gravitational interactions between planets can influence their orbits and lead to phenomena such as orbital resonance. Overall, gravity ensures the stability and structure of the solar system.