Relativity: The Special and General Theory

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   Time does not flow the same for everyone — a clock moving very fast or sitting near a huge mass runs slightly slower.

   Relativity: The Special and General Theory · 1916

   Picture space and time as a stretched elastic sheet. A heavy planet bends it, just like a heavy ball bends a stretched blanket. Other objects passing by slide along that curve, which we call gravity. The heavier the mass, the stronger the curve — and the stronger the effect on time.

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