Parallel universes have never been
observed. They have been speculated in a great
many ways, based on symmetry arguments and other
mathematical calculations, intuition, or even
religion (Heaven and Hell are essentially parallel
universes, if you believe in them).
If you can't measure them, but cannot measure
that they do not exist, then they are not science.
This does not mean that they do not exist, but
merely that their existence is not a question that
science can answer (not until we could measure
their existence or lack thereof, that is).
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