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How Scientists Verified One of Einstein's Most Controversial Theories
100 years ago, Albert Einstein posited a theory of space-time that came to be one his most controversial ideas. Until scientists this year were able to verify it when they detected gravitational waves.
An illustration shows a pair of neutron stars orbiting each other very closely, sending gravitational waves pulsing along the skin of space-time.Mark Garlick / Science Photo Library/Getty Images