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Do we have a theory that can tell us how much change gravitational waves can make to space time. If it is infinite then I think any time we can see biggest change in space time and how much could it affect to humans?

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Gravitational waves cause a stretch and squeeze in space-time. It has two polarizations Plus and Cross polarization. This serves as an axis for the stretch and squeeze when a gravitational wave hits a body. However, the order of stretching and squeezing is actually really small. It changes space-time by an order of $10^{-21}$m. That's around the diameter of a proton. There are Numerical relativity simulations where you can see for yourself how much the change in space-time occurs for a certain pair of mass collisions.

Check out the Waveforms for SEOBNR, Taylor etc. You might get a good idea.

FYI : Question belongs in physics.stackexchange

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