General Relativity part 2: Curvature in 3 and 4 dimensions.

In six Level 1 videos we review General Relativity from the substratum viewpoint.

Here in part 2 of 6:  We move on from 2d space to 3d space and 4d spacetime. In the Schwarzschild spacetime, we find that space contracts in the radial direction, and time slows down near a black hole. For a shell, we see that the flat spacetime inside the hole differs from flat spacetime far away.

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