General relativity and quantum mechanics are two separate theories that explain different aspects of the physical world. General relativity describes the behavior of large objects in the universe, such as planets and galaxies, while quantum mechanics explains the behavior of subatomic particles.
There have been attempts to unify general relativity and quantum mechanics into a single theory, such as string theory and loop quantum gravity. However, a complete unification has not yet been achieved and remains an ongoing area of research in theoretical physics.
According to general relativity, the presence of mass and energy in the universe causes spacetime to curve. The more massive an object is, the greater its curvature of spacetime. This curvature is what we experience as the force of gravity.
The uncertainty principle states that the more precisely we know the position of a particle, the less precisely we can know its momentum, and vice versa. This is due to the inherent probabilistic nature of quantum mechanics.
In general relativity, light is affected by the curvature of spacetime caused by massive objects. As it travels through this curved spacetime, light appears to bend due to the warping of its path. This phenomenon is known as gravitational lensing.