The LIGO experiment which detected gravitational waves, did so by measuring four, 4 km long regions on the Earth. As the gravitational wave passed over the Earth it was stretched in one direction, and compressed in another. LIGO was able to measure this change in shape.
So how much are we being contorted? Well, over one of the 4 km long lengths that LIGO was measuring, the length altered by 1/100,000,000 of the width of an atom!
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