General Relativity is the theory of gravitation that was developed by Albert Einstein in the early 20th century.

Time Dilation is the phenomenon that occurs when an object moves through space at speeds close to the speed of light, causing time to slow down for that object relative to an observer at rest.

Length Contraction is the phenomenon that occurs when an object is accelerated or decelerated, causing its length to decrease in the direction of motion.

Gravitational Lensing is the phenomenon that occurs when light passes through a gravitational field, causing it to bend and focus.

Black Hole Formation is the phenomenon that occurs when a massive object collapses under its own gravity, creating a region of space-time where gravity is so strong that nothing, not even light, can escape.

A Wormhole is a hypothetical object that is said to connect two different points in space-time, allowing for faster-than-light travel.

A White Hole is a hypothetical object that is said to be the endpoint of a black hole, allowing for matter and energy to escape from the black hole.

A Singularity is a hypothetical point in space-time where all matter and energy are concentrated, creating a region of infinite density and curvature.

A Graviton is a hypothetical particle that is said to be responsible for the force of gravity.

A Theory of Everything is a hypothetical theory that seeks to unify all the forces of nature into a single theory.

Quantum Gravity is a hypothetical theory that seeks to unify quantum mechanics and general relativity.

String Theory is a hypothetical theory that seeks to unify all the forces of nature and explain the origin of the universe.

Dark Energy is a hypothetical object that is said to be responsible for the dark energy that is causing the universe to expand at an accelerating rate.

Dark Matter is a hypothetical object that is said to be responsible for the dark matter that makes up about 27% of the universe.

The Cosmological Constant is a hypothetical object that is said to be responsible for the cosmological constant that is causing the universe to expand at an accelerating rate.