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How do we know how fast gravity waves travel?

John Patterson, California, Maryland
RELATED TOPICS: GRAVITATIONAL WAVES
Gravitational wave
In 1915, Albert Einstein published his theory of general relativity, which implied that gravitational waves should exist and propagate at the speed of light. This means that if the Sun vanished, Earth would go dark and drift off into space some 8 minutes later. The idea was a radical departure from Isaac Newton’s belief that gravity was instantaneous.

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