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They stopped making good scifi movies 20 years ago.Wow ok, if only interstellar had some gay sword fighting with laser beams that end in thin air for no fucking reason, I bet that would've made the science less bullshit and the movie much better.
Time dilation explains why two working clocks will report different times after different accelerations. For example, ISS astronauts return from missions having aged slightly less than they would have been if they had remained on Earth, and GPS satellites work because they adjust for similar bending of spacetime to coordinate with systems on Earth.[1]