string theory

What string theory really proposes, the extra dimensions, M-theory, the multiverse landscape, and why critics call it unfalsifiable in 2026.

There may be infinitely many universes where you made different choices. Here's what physics actually says about the multiverse.

General relativity describes gravity at cosmic scales. Quantum mechanics rules the subatomic world. They are mutually incompatible — and unifying them is the deepest unsolved problem in all of physics.

The multiverse isn't just sci-fi — it's a serious prediction of multiple physics theories, including quantum mechanics, inflation, and string theory. Here's what the science actually says.