Gravity is the force by which a planet or other body draws objects toward its center.
The force of gravity is proportional to the mass of the objects and the distance between them.
The first scientific explanation of gravity was given by Sir Isaac Newton in his 1687 work "Philosophiæ Naturalis Principia Mathematica"
Newton’s law of gravitation states that every point mass in the universe attracts every other point mass with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between them.
Einstein’s theory of general relativity, published in 1915, describes gravity as a curvature of spacetime caused by the presence of mass or energy.
Gravity is what keeps the planets in orbit around the sun and the moon in orbit around Earth.
The gravitational pull of the moon causes the tides on Earth.
The gravitational pull of a black hole is so strong that nothing, not even light, can escape it.
The strength of gravity on the surface of a planet or moon depends on the mass of the object and its radius.
The study of gravity and its effects is known as gravitation, and scientists who study it are known as gravitologists.
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