Special relativity is a theory in physics that explains how time and space are related. It was developed by Albert Einstein and is based on two main principles:

1. The laws of physics are the same for all observers in uniform motion relative to one another.

2. The speed of light is always constant, no matter how the observer is moving.
Because the speed of light is constant, time and space can be combined into a single concept called spacetime. This means that time is not absolute, but rather is relative to the observer's position and motion.

E=mc^2 is an equation that relates energy and mass. It states that energy (E) is equal to mass (m) times the speed of light (c) squared. This equation shows that mass and energy are interchangeable and that a small amount of mass can be converted into a large amount of energy, and vice versa. This is the basis of nuclear reactions that powers stars, atomic bombs and nuclear power plants.
spam fails_task lang_mismatch pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence