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Branes are objects in M-theory and its offshoot, brane cosmology.
In M-theory, p-branes (the name is derived from membrane) are objects of spatial dimensionality p (for example, a string is a 1-brane). In brane cosmology, the term "brane" is used to refer to objects similar to our four-dimensional universe which move in a higher-dimensional "bulk".
See also: P-branes, D-branes
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