I once thought I understood the fourth
dimension and stated that it was “duration,” the existence of an
object in three dimensions was only possible if it existed within
time, the fourth dimension. It is more complex than that of course,
but our understanding of time is based on what we have experienced
here, on earth. We live on a planet with a steady state of gravity
moving at a steady pace around the sun. In the movie, Interstellar
(minor spoiler ahead), there is a planet orbiting a black hole and
anyone on it experiences severe time dilation. Red flags go up yet?
Yeah, sorry Hollywood, we just lost our suspension of disbelief. But
let's get past the fact that a planet would have to be so close to a
black hole to experience the amount of time dilation stated in the
movie that it would get sucked into the black hole, and the fact that
a rotating planet would experience tidal forces of gravity that would
rip the planet to pieces. Let's put all that on hold and examine the
concept itself...
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