spacetime

Gravity explained: Newton's universal law, Einstein's curved spacetime, gravitational waves, and why GPS satellites must correct for it.

Wormholes: theoretical tunnels through spacetime. Einstein-Rosen bridges, exotic matter, traversability, ER=EPR, and time travel paradoxes explained.

Einstein's special and general relativity explained simply: time dilation, E=mc², curved spacetime, gravitational waves, and tests that confirm them.

What is a black hole, really? Event horizons, Hawking radiation, spaghettification, the nearest known black holes, and the first images of M87* and Sgr A*.

Time slows down, space bends, and mass becomes energy. Einstein's relativity is strange but beautifully logical.

Space and time aren't separate things — they're a single four-dimensional fabric that can bend, stretch, and warp. Massive objects curve spacetime, and that curvature is what we experience as gravity. Here's what Einstein actually discovered.