General relativity has grown more important than it was in Einstein's day https://www.sciencenews.org/article/einsteins-genius-changed-sciences-perception-gravity Albert Einstein opened humankind’s eyes to the universe. Before Einstein, space seemed featureless and changeless, as Isaac Newton had defined it two centuries earlier . And time, Newton declared, flowed at its own pace , oblivious to the clocks that measured it. But Einstein looked at space and time and saw a single dynamic stage — spacetime — on which matter and energy strutted, generating sound and fury, signifying gravity. Newton’s law of gravity had united the earthly physics of falling apples with the cosmic dances of planets and stars. But he couldn’t explain how, and he famously refused to try. It took an Einstein to figure out gravity’s true modus operandi. Gravity, Einstein showed, did not just make what goes up always come down. Gravity made the universe go ’round. Xem thêm phần Henry Poincare giải bài...