Einstein (Albert Einstein, theory of relativity)

Albert Einstein's theory of relativity fundamentally changed our understanding of space, time, and gravity. Special relativity shows that time and space are linked, and that the faster an object moves, the slower time passes for it relative to others—especially near the speed of light. General relativity describes gravity not as a force, but as the warping of spacetime caused by mass and energy. Massive objects like stars curve spacetime around them, and this curvature guides the motion of planets and light. Together, these theories provide a deeper, more accurate picture of how the universe operates on large and small scales.