Scientists test Einstein's theory of gravity on the scale of the universe

Scientists test Einstein’s theory of gravity on the scale of the universe

Everything in the universe has gravity – and feels it too. Yet this most common fundamental force is also the one that poses the greatest challenges to physicists. Albert Einstein’s theory of general relativity was remarkably successful in describing the gravity of stars and planets, but it doesn’t seem to apply perfectly to all scales.

General relativity has passed many years of observational testing, from Eddington’s measurement of starlight deflection by the Sun in 1919 to the recent detection of gravitational waves. However, gaps in our understanding begin to appear when we try to apply it to extremely small distances, where the laws of quantum mechanics operate, or when we try to describe the entire universe.

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