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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.
Conceptual image of gravtitational 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