Brane Cosmology

Brane cosmology, stemming from string theory, proposes our universe exists on a multidimensional membrane ("brane") floating in a higher-dimensional space. This radical theory suggests parallel universes could reside on separate branes, occasionally colliding in ways that might explain cosmic phenomena like the Big Bang. Unlike traditional multiverse concepts, brane cosmology implies these alternate realities could be mere millimeters away in an unseen dimension, yet completely inaccessible. The theory remains speculative but offers physicists a compelling framework to reconcile string theory with observed cosmology while potentially explaining dark energy's mysterious effects on universal expansion.