General Relativity

Albert Einstein’s theory of General Relativity (GR) replaced Isaac Newton’s theory of Classical Gravity as the most accurate description of gravitation. Specifically, General Gravity transforms the concept of gravity from a force between objects to a property of spacetime. Black holes are one of the many fascinating consequences of General Relativity. (See also Special Relativity.)


The gluon is a boson that mediates the strong interaction. Gluons are hypothesized to interact with each other to form transient composite structures called glueballs.


The graviton is a theorized boson intended to include the gravitational force in the Standard Model. No graviton has ever been experimentally observed and its theoretical underpinnings remain uncertain.


Gravity is classically considered a force between massive objects governed by the equation F = Gm1m2/r^2 first discovered by Isaac Newton. However, General Relativity reframes gravity as a property of spacetime. Gravity is one of the four fundamental forces.