Parallel Universes
Another idea that arises from string
theory is the notion of "braneworlds" — parallel universes that hover
just out of reach of our own, proposed by Princeton University's Paul
Steinhardt and Neil Turok of the Perimeter Institute for Theoretical Physics in
Ontario, Canada. The idea comes from the possibility of many more dimensions to
our world than the three of space and one of time that we know. In addition to
our own three-dimensional "brane" of space, other three-dimensional
branes may float in a higher-dimensional space.
Out universe may live on one
membrane, or "brane" that is parallel to many others containing their
own universes, all floating in a higher-dimensional space.