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The only (I assume a very, very simplified and abstracted) explanation I even begin to understand at all, about why time can "pass quicker" to some observers than others, is the curvature of space time around large objects in space. The explanations seem to usually say that when a massive object "curves spacetime", light that travels in that object's gravitational field (in curved spacetime) must travel a greater distance because of the curvature of the spacetime it travels in. Then, assuming the speed of light is constant for all observers, it must always move in the same speed from any observer's point of view, and someone positioned in that curved spacetime around a massive object must still observe the speed of light to be constant. Therefore, I guess the only way that is possible, is for "time" to "slow down" for that observer in that curved spacetime.
???
Thinking of that, it feels impossible to move backwards in time, unless you count having "fallen behind" from someone else's time, relatively, to be traveling backwards in time. If I'm not a total dolt, this whole thing was the big idea behind Interstellar at least. Things like "timeloops", etc. like in the movie Looper seem much more fun though, but have been overused to the extent that I tend to steer clear of any films dealing with time travel.
Have to admire the people who actually understand any of this stuff on a more detailed level. Even their oversimplified abstractions just swoosh over my head 99% of the time.
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