the Theory of Relativity (by Albert Einstein)

The Theory of Relativity, developed by Albert Einstein, describes how the laws of physics behave in different frames of reference and how gravity affects space and time. Special relativity, introduced in 1905, shows that as objects move close to the speed of light, time slows down and lengths contract for them compared to stationary observers. General relativity, published in 1915, explains that gravity is not a force but the curvature of spacetime caused by mass and energy. Together, these ideas revolutionized our understanding of the universe, showing that space, time, and gravity are interconnected and relative depending on motion and gravity's influence.