Whose theory explained gravity as curved spacetime?

While Isaac Newton described gravity as a force of attraction between masses, it was Albert Einstein who revealed its deeper nature. In his general theory of relativity, published in 1915, Einstein proposed that massive objects warp the fabric of space and time, called spacetime, and that what we experience as gravity is really objects moving along the curves created by this warping. A common analogy compares spacetime to a stretched rubber sheet that dips under a heavy ball, causing smaller objects to roll toward it. This theory made startling predictions that Newton physics could not, including that light would bend around massive objects and that time runs slower in stronger gravity. These predictions have been repeatedly confirmed, from the bending of starlight observed during a 1919 eclipse to the detection of gravitational waves in 2015. General relativity remains our best description of gravity.