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Waves in spacetime formed by the acceleration of massive bodies. A passing wave causes spacetime to be stretched and squashed by a very small amount. Typically we can only detect the most energic gravitational events such as black hole mergers.

1
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To put this in perspective, consider a fifty-plus year old human whose main source of exercise for the last twenty-plus years has been walking back and forth between work and the parking spot where th …
answered Feb 27 '16 by David Hammen
11
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A belated answer, but neither of the existing answers properly explain this. The proper explanation is simple. In Newtonian mechanics, tidal influences make all objects in retrograde orbits and those …
answered Jul 19 '17 by David Hammen