String Theorists Squeeze Nine Dimensions Into Three - Science News:
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A simulation of the early universe using string theory may explain why space has three observable spatial dimensions instead of nine.
The leading mathematical explanation of physics goes beyond modern particle theory by positing tiny bits of vibrating string as the fundamental basis of matter and forces. String theory also requires that the universe have six or more spatial dimensions in addition to the ones observed in everyday life. Explaining how those extra dimensions are hidden is a central challenge for string theorists.
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