Is the universe fully deterministic?

Question

Resolves to physicists' best guess once we have a Theory of Everything and there don't seem to be any more unanswered questions that could in principle be answered.

This is about determinism in principle, not about what we observe. If the many-worlds interpretation of quantum mechanics is true, that counts as deterministic, even though we can't know what branch we're going to be in and it subjectivly seems random.

Manifold Markets · Answer

Likely — Manifold Markets prediction market estimates a 75% chance (75 traders, as of Feb 7, 2026).