A dimension is a variable in which the position
of an event can vary. We know of four dimensions
in our universe: three of which are present in
space, and the fourth of which is time.
String theory predicts that there are more
dimensions that particles can move around in but
which are difficult to observe because of the
mathematically complicated physics that string
theory describes. None of these other dimensions
have remotely compelling evidence to support them,
however, so most scientists prefer to use simpler
theories that use only the four dimensions that we
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