>>11427010>Or the outside events running faster?I mean whether you say clock A runs slower or clock B runs faster doesn't really matter. What matters is the difference in rates of clock A and B, as recorded by the outside observer.
>What about that experiment with watches, when clock on the ship show different time?I can't figure out what this means, can you rephrase?
>Time dilates on the ship, but length contracts outside of it?The ship time dilates from the outside perspective, and the outside distance contracts from the ship perspective. The net result of either these is the ship going from A to B in the same amount of ship time.
These effects of time dilation and length contraction are really symmetric between the reference frames. The ship would see the outside observer's clock slow down, and the outside observer would see the length of the ship contract.
You might think that, if the effects are symmetric, then the distance of the journey should also contract for the outside perspective. But this isn't true because the outside observer is at rest with respect to points A and B of the journey, so they are able to directly measure the so-called "proper length" between A and B