I’ve been thinking about gravity and time. I get that percieved time changes depending on which planet you’re on, more gravity= faster time is. I also understand that the person on that planet will not notice any difference.
For an example, ben teleports to a super big planet, and hangs out there for 5 hours, teleports back to earth and boom, its been 5 months in earth time.
But, if we somehome could, with a telescope, see ben on that big planet, would we percieve him as going slomo, or almost not moving?
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It’s not just gravity, anything being accelerated will cause time to slow relative to anything outside the field of acceleration.
When I looked this up on Wikipedia, I see two objects travelling towards or away from each other at a fixed near-light velocity will also experience time dilation.
Although both frames of reference will experience equal dilation. You need acceleration, or gravity, for one reference frame to experience permanent time dilation relative to the other.
I can see how moving towards each other at near light speed will cause time dilation, as otherwise light may appear to travel faster than light speed.
However moving apart at near light speed will also cause this. So light cannot appear to travel slower than light speed either. It is always at a constant velocity, depending on the medium it is travelling through.
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