Gravity is the natural phenomenon by which all objects with mass are brought towards each other. It is the force that keeps planets in orbit around the sun, and objects on Earth from floating away.
Gravity is caused by the curvature of spacetime created by massive objects. The more massive an object is, the more it bends the fabric of spacetime, causing other objects to be pulled towards it.
The concept of gravity has been known since ancient times, but it was Sir Isaac Newton who first described it mathematically in his theory of universal gravitation in the 17th century.
No, gravity is a fundamental force of nature and cannot be turned off or manipulated by humans. However, there are certain situations where the effects of gravity can be counteracted, such as in outer space or on a zero-gravity flight.
According to Einstein's theory of general relativity, gravity can affect the passage of time. The closer an object is to a massive object, the slower time will pass for that object. This is known as gravitational time dilation.