i am sure that you all know experiments have been done with atomic clocks in outer space and it was found that the atomic clocks that had been in orbit of the earth were further ahead than the ones on earth, does this mean that you travel slightly faster through time while in orbit of the earth? i was thinking about this one, and i came to a very simple explination. the difference in gravity between the surface of the earth and the gravity experienced in orbit of earth is enough that an atom moving on earth would be slowed slightly because of the forces of gravity. you might say that electrons(maybe protons and neutrons too) arent effected by gravity, but if that is so, then why do atoms fall to the ground if they are denser than air on earth? just pretend, even if you dont think it is true, that the electrons moving around the nucleus of an atom are subject to gravitys pull. now with the decrease in gravity in orbit of the earth(or space for that matter), would it not be reasonable to think that the reason atomic clocks move faster through space is because the atoms have less gravitational resistance, and not that time moves faster in space? in summary: gravity slows atomic movement, which explains why clocks are faster in space.