Isaac Newton was the first to connect gravity to planets other than Earth. He proposed that other planets and stars also have gravitational force. In fact, it was present everywhere in the universe. Planets including Earth remain in their orbits and rotate around the Sun due to the force of gravity exerted by the Sun. It is Earth’s gravitational force that keeps the Moon moving in its orbit. The pull of the Earth causes Moon to travel in a curved path.
The same principle applies to satellites in orbit around Earth. If Earth had no gravity, the satellites would fly off into space. We can very well say that gravity is what binds the solar system together.
The planets also disturb each other’s orbits due to gravity. These disturbances are termed as ‘perturbations.’ Scientists discovered Neptune because of the unexpected perturbations observed in the orbit of Uranus.
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