What is the origin of gravity?

Answer 1

Gravity has always been in the universe as soon as it was created. Gravity is created by the mass of an object. Therefore, gravity has always been here as long as the first planet or mass of objects was created.

Answer 2

In 1998, two teams of astronomers studying the expansion of the universe discovered something unexpected. Analyzing the results of their observations, they came to the conclusion that the universal expansion, known since 1929, was accelerating. It was a great surprise, because they expected to find evidence to the contrary, that, due to gravity, the cosmic expansion was losing speed. In 2011, three of the astronomers in charge of these projects received the Nobel Prize in physics "for the discovery of the accelerating expansion of the Universe through observations of distant supernovae. From the moment I found out, it seemed to me that this discovery would mark a before and after in our understanding of the universe. The key point, in my opinion, is acceleration, because thanks to Einstein's Equivalence Principle we can see gravity as a form of acceleration. The principle tells us that we cannot distinguish between the effects of a uniform acceleration and the effects of a gravitational field. Isn't it curious that acceleration is indistinguishable from gravity? Doesn't it lead us to suspect that behind this apparent equivalence lies something else? It is evident that the Earth itself is not expanding with an acceleration "g" and yet, if so, the consequences would be the same as those of a gravitational field. Isn't it very strange? How can we explain the equivalence between these two facts? Is it possible that the Earth is undergoing a "hidden" acceleration that we can only detect through its apparent power of attraction? All these questions were in my mind BEFORE that year of 1998. And then… I found out that the expansion of the universe was accelerating! It is easy to understand why I linked both accelerations, the "hidden" and the newly discovered. The challenge, of course, was to figure out how that supposed relationship would occur. Finally, after much reflection on the matter, I came up with a hypothesis that seems reasonable to me and that is the following. The accelerating spatial expansion, detected in 1998, would be only the most evident aspect of a more general phenomenon, of an acceleration that would be affecting each object of the universe in its FOUR dimensions (three spatial and one time-like).

For more on my hyphotesis see: What-could-be-the-origin-of-gravity/answer/Enrique-Casanovas-3

Answer 3

Gravity is a fundamental force in the universe that manifests as the attraction between objects with mass. According to the theory of general relativity proposed by Albert Einstein, gravity is a result of mass bending the fabric of spacetime. This curvature of spacetime dictates the motion of objects and is responsible for the phenomenon we experience as gravity.