Study of the behavior of objects in motion and the structure of space and time.
Special Theory of Relativity: A theory describing the relationship between space and time, and how they are affected by motion.
General Theory of Relativity: A theory that expands on the special theory of relativity, describing the relationship between gravity and space-time.
Lorentz Transformations: A set of equations that describe how space and time coordinates of an event appear differently to observers in relative motion.
Spacetime: A fusion of the three dimensions of space with one dimension of time into a single four-dimensional space-time continuum.
Mass-energy equivalence: The concept that mass and energy are equivalent and can be converted into each other.
Space-time curvature: A theory that gravity is the result of the curvature of space-time caused by the presence of mass and energy.
Black Holes: A region in space where the gravitational pull is so strong that nothing can escape it, including light.
Time dilation: The difference in the elapsed time measured by two observers due to a relative velocity between them or the difference in the gravitational potential.
Length contraction: The concept that objects appear shorter in the direction of motion when measured by an observer in relative motion.
Relativistic mass: The mass of an object as measured by an observer in relative motion, which differs from the object's rest mass.
Twin paradox: A thought experiment that involves a pair of twins, one of whom travels through space while the other stays on Earth, resulting in different aging rates.
Gravitational waves: Ripples in the curvature of space-time caused by the acceleration of massive objects, propagating as waves through the universe.