(via Minute Physics) This video is chapter 2 in my series on special relativity, and it covers spacetime diagrams, rotational and translational symmetry of both time and space, how certain ...

This week on Spacetime, we take a detour into how geometry works in spacetime. Last time we talked about what curvature means, looked at geodesics, great circles on spheres, and tried to understand ...

Whether space-time exists should neither be controversial nor even conceptually challenging, given the definitions of “space-time,” “events” and “instants.” The idea that space-time exists is no more ...