Isaac Newton’s revolutionary theories on gravity in 1665 were thought to be inspired by seeing an apple fall from a tree. He realized that the same forces that pull an apple downwards when falling from a tree were the same forces that kept the Moon in place in orbit around the Earth.Gravitation is a natural phenomenon by which physical bodies attract each other with a force proportional to their masses.
Gravitation causes dispersed matter to coalesce, and coalesced matter to remain intact, thus accounting for the existence of the Earth, the Sun, and most of the macroscopic objects in the universe. Gravitation is most familiar as the agent that gives weight to objects with mass and causes them to fall to the ground when dropped. It is very important because it allows matter to remain intact, it is what makes our planet orbit the Sun and keeps the Moon orbiting the Earth, it helps to form the tides, and it can be best described by the weight it gives objects when they fall to the ground when dropped. Gravity is one of the four fundamental forces of nature along with weak nuclear forces, strong nuclear forces and electromagnetism. Our bodies are pulled down onto the surface of the Earth by gravity. If there was no gravity we would float away. Gravity is different depending on where you are on the Earth.
It is often said that the laws of nature apply to the earth, there is a huge difference with the laws in the sky. Newton's law of universal gravitation countered that view, the law proved that the laws governing nature and the universe is not complicated. Newton developed the concept of universal gravitation forces, he pointed out that the force of gravity is not only a characteristic of the celestial bodies, but also a characteristic of all things. Law of universal gravitation and its mathematical formula became the basis of the physics, is one of the most important scientific law of humanity.