This is an especially cool diagram for relativity theory, but it's rather hard to find in print. There's a limited version of it in ...

Cosmological horizons are rather arbitrary. The cosmological limit to direct observation is at different places for different observers, an...

Mathematics doesn't always translate directly to physics. That statement might sound odd to a mathematician, but consider this: even if ...

Textbooks tend to present special relativity's physical predictions as if they're somehow "out on a limb", and totally dis...

This is where I surprise everyone by saying something nice about Einstein's Special Theory of Relativity for a change. Considered as a ...