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A theoretical framework extending general relativity and cosmology by proposing that spacetime has more than the familiar three spatial and one temporal dimension—potentially 5, 10, or 26 dimensions, depending on the model. These extra dimensions may be compactified (curled up at microscopic scales) or large but hidden, explaining why we don’t perceive them in everyday life. The theory is central to string theory and M‑theory, where additional dimensions allow the unification of gravity with quantum mechanics. It also has implications for cosmology (why the universe expands), particle physics (why masses have specific values), and speculative possibilities like wormholes or time travel.
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