What is the correct theory of gravity?

Until the 1910s Sir Isaac Newton’s law of universal gravitation, two particles attract each other with a central force proportional to the product of their masses and inversely proportional to the square of the distance between them, was accepted as the correct and complete theory of gravitation: The proportionality …

What does the general theory of relativity state?

Einstein’s 1915 general theory of relativity holds that what we perceive as the force of gravity arises from the curvature of space and time. The scientist proposed that objects such as the sun and the Earth change this geometry.

What is the theory of quantum gravity?

Quantum gravity (QG) is a field of theoretical physics that seeks to describe gravity according to the principles of quantum mechanics, and where quantum effects cannot be ignored, such as in the vicinity of black holes or similar compact astrophysical objects, and where the effects of gravity are strong, such as …

How does string theory explain gravity?

Many scientists believe in string theory because of its mathematical beauty. The theory explains gravity via a particular vibrating string whose properties correspond to that of the hypothetical graviton, a quantum mechanical particle that would carry the gravitational force.

How did Isaac Newton test his theory of gravity?

In 1728, Newton demonstrated the universality of the force of gravity with his cannonball thought-experiment. Here Newton imagined a cannon on top of a mountain. Without gravity, the cannonball should move in a straight line. If gravity is present, then its path will depend on its velocity.

Who proposed the theory of gravity?

Isaac Newton
Isaac Newton was the first to develop a quantitative theory of gravity, holding that the force of attraction between two bodies is proportional to the product of their masses and inversely proportional to the square of the distance between them.

Does gravity exist in general relativity?

In general relativity, gravity is not a force between masses. Instead gravity is an effect of the warping of space and time in the presence of mass. Without a force acting upon it, an object will move in a straight line.

Why is gravity a theory?

So, is gravity a theory or a law? Well, first of all, it is an always acting force that one can feel. Second, it is both a theory and a law. The law of gravity calculates the amount of attraction while the theory describes why objects attract each other in the first place.

Is string theory a theory?

In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings. String theory describes how these strings propagate through space and interact with each other. Thus string theory is a theory of quantum gravity.