What is the fourth dimension? It is
generally referred to as “spacetime,” the unification of time and
space as a four-dimensional continuum. More and more science fiction
these days involves spacetime in some form, and it is an intriguing
concept. The Yahoo space comedy “Other Space” and the recent
movie “Interstellar” both come to mind as examples of how time
might behave differently in other parts of the universe. It is a
complicated concept, one that involves “special relativity” and
other theories advanced in physics, but there are some basic tenants
that we can grasp without holding a degree in quantum physics. To put
things very simply, time is relative to velocity and the strength of
gravity.
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