space and time question

[andytheplumb]

when we move through space time slows down ive heard, to the point where at the speed of light time stops.
ok so we are moving round our solar system which inturn is moving round the milky way so we are obviously moving through time faster than 0 mph meaning times speeding up, but if we were stop completely, i.e. solar system and galaxy moving of without us would time go on forever??

[fo3nix]

"
when we move through space time slows down ive heard, to the point where at the speed of light time stops. "

This is true. Einstein's Special Relativity.

"we are obviously moving through time faster than 0 mph"

No, mph is a measure of distance, not time. Relative to some object, the Earth is moving through space pretty fast.

If we were to measure the speed of Earth in some frame of reference (as they're called), that happens to show the Earth moving close to the speed of light (perhaps our frame is in fact moving with near-speed of light constant velocity away from Earth), then yes, time would appear stopped to us.

It's a question of frame of reference. It looks some way in your frame of reference, but not this way to others. It can get confusing very quickly!

(All this is for inertial frames of reference, i.e., no acceleration. With this taken into account takes us to General Relativity, producing all sorts of other little peculiarities.)

[mibn2cweus]

Time is constant within ones owe reference frame regardless of ones velocity direction or acceleration. It is only in comparison to an object in motion relative to ones own reference frame that time dilation is observed. Time, distance and space are not discrete entities, they are intimately related. When we move through space the passage of time slows proportionately so as to satisfy the constancy of the velocity of light. For instance; suppose that you and I are sitting on a park bench and we sync our watches to the exact same time. If I then got on a rocket and flew around the moon and then came back to the same park bench where you had been sitting, waiting and we compared our watches mine would now again be ticking at the same rate as yours but would show a loss of time. While I was in motion relative to you my watch ran slower (my time passed slower) than yours, not for me while I traveled with it but only in comparison to you and your watch sitting still. Neither of us experienced time dilation, its simply a consequence of motion through space.

[AlbertoFiz]

Time is a drag.