Newton`s law of universal gravity is generally stated that each particle attracts all the other particles of the universe with a force directly proportional to the product of its masses and inversely proportional to the square of the distance between its centers. [Note 1] The publication of the theory became known as the „first great union“ because it marked the union of the gravity phenomena previously described on Earth with known astronomical behaviors. [1] [2] [3] Another 11th century Persian polymath, Al-Biruni, suggested that celestial bodies have mass, weight, and gravity, just like the Earth. He criticized Aristotle and Ibn Sina for holding the view that only the earth has these qualities. [19] The 12th century scholar Al-Khazini It has been proposed that the gravity contained in an object varies according to its distance from the center of the universe (relative to the center of the Earth). Al-Biruni and Al-Khazini studied the theory of the center of gravity and generalized it and applied it to three-dimensional solids. They also established the theory of the weight lever and created the science of gravity. Fine experimental methods to determine the specific gravity or specific gravity of objects have also been developed, based on the theory of balances and weighing. [20] When this happens, scientists usually modify the theory to fit the anomalous observation, or reject it altogether and develop a new theory. At the beginning of the 20th century, Einstein took the latter path.

He questioned the existence of the gravitational force and revolutionized physics by postulating a universe in which such a force was rendered superfluous. Instead of Newton`s theory, Einstein developed an even more bizarre formulation, the theory of general relativity. He postulates that gravity is not a force, but a result of the fabric of space – composed of the three spatial dimensions length, width and height and the fourth dimension of time – bent by the presence of massive objects such as the sun or a planet. Newton`s law has since been replaced by Albert Einstein`s theory of general relativity, but continues to be used in most applications as an excellent approximation of the effects of gravity. The theory of relativity is only needed when extreme precision is required or when it involves very strong gravitational fields, such as those found near extremely massive and dense objects or at small distances (such as Mercury`s orbit around the Sun). Indian mathematician and astronomer Brahmagupta (c. 598 – c. 668 AD) first described gravity as a force of attraction and used the term „gurutvākarṣaṇam (गुरुत्वाकर्षणम्)“ to describe it:[9][10][11][12] In 1922, Jacobus Kapteyn proposed the existence of dark matter, an invisible force that moves stars in galaxies at speeds greater than gravity alone. In 2013, it turned out to be 26.8% of the early universe. [64] Along with dark energy, dark matter is an aberration in Einstein`s theory of relativity, and an explanation of its apparent effects is a prerequisite for a successful theory of everything. Equations (1) and (2) can be used to derive Kepler`s third law for the case of circular planetary orbits. Using the expression for acceleration A in equation (1) for gravity for planet GMPMS/R2 divided by the mass of planet MP, we obtain the following equation, in which MS is the mass of the Sun: While Newton was able to formulate his law of gravity in his monumental work, he was deeply uncomfortable with the notion of „action at a distance“.

what his equations implied. In 1692, he wrote in his third letter to Bentley: „That one body far away can act on another by emptiness, without anything else being mediated, by and by its action and power can be transmitted from one another, is for me such a great absurdity that, I believe, no man who has a faculty of thought competent in philosophical matters, could ever fall into it. To be clear, we do not deny the obvious observation that an apple falls from a tree to the ground or that our planet revolves around the sun. However, the scientific explanation for these observations or facts – that there is this gravitational pull called gravity and behaves according to the law of gravity – did not exist until Newton invented it in the 17th century. Moreover, Newton`s law of gravity survived not only because it was an imaginative thought of a genius` mind, but also because it predicted and explained many observations that troubled physicists in his day, from the particular orbital motions of planets around the sun to the appearance of tides. Over time, however, it was found that observations, such as distortions in Mercury`s orbit, were not accurately predicted by Newton`s law of gravity. An Indian minister recently put gravity in the spotlight when social media mocked him for clearly not knowing who discovered gravity. I will be provocative and challenge the premise underlying the question of whether gravity was actually discovered.

I`m sure most people would doubt my sanity if I asked that question. But let`s play this game and see where it leads. The second Indian to comment on gravity was Brahmagupta (598-670 AD). He was a Hindu astrologer and mathematician who thought the earth was spherical and attracted things. He even compared it to things like water and fire. He also spoke of „gravity“ in one of his statements: when mercury is poured into a container and a hundred-pound stone is placed there, the stone floats on the surface and cannot push, pierce or separate the liquid.