Yes, the explanation for the time
dilation on the planet was poor in Interstellar (thankfully, the
comedy “Other Space” didn't even bother to offer an explanation
for their time-dilated planet, which ironically made it seem more
plausible.) Despite that, time dilation is real and has been
confirmed by many scientific experiments: the relativistic decay of
muons from cosmic ray showers and the slowing of atomic clocks aboard
a Space Shuttle have shown us that the duration of time can vary
according to the point of reference. It all makes for great science
fiction material, where someone might travel faster than the speed of
light, spend a lifetime on a time-dilated planet, travel back to
Earth, and be the same age (or younger?) than when he or she left,
maybe even arriving close to the original departure date.
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