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Capping the length of extra dimensions

Size and age of recently discovered black hole shrinks braneworld

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6:53pm, July 7, 2009

Red alert: Scientists are shrinking branes.

A team of theoretical physicists and astronomers has calculated that any hidden extra dimension beyond our familiar three-dimensional space, a world known in physics parlance as a 3-brane, must be less than 3 micrometers. The researchers base their findings on the recent discovery of one of the smallest and oldest black holes ever found.

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