Special Relativity:
* Time and space are not absolute: They are relative to the observer's motion.
* The speed of light is constant for all observers: No matter how fast you're moving, light always travels at the same speed.
* Mass and energy are equivalent: This is famously expressed as E=mc², meaning that mass can be converted into energy and vice versa.
General Relativity:
* Gravity is not a force, but a curvature in spacetime: Massive objects warp the fabric of spacetime, causing other objects to move along these curves, which we perceive as gravity.
* Time slows down near massive objects: This effect is known as time dilation.
In short, Einstein's theory of relativity changed our understanding of gravity, time, space, and the universe. It has profound implications for everything from GPS systems to black holes.
