Dirk Van de moortel wrote:
"CFran" wrote in message ups.com...
If I got it right, the faster you go, the slower time goes for you.

No, that is wrong. You notice nothing about time.

oh, yeah, that's right, it looks like outside things accelerate (i
think)

The faster you go with respect to someone, the longer the time
that person will measure between two ticks on *your* clock,
and likewise, the longer the time *you* will measure between
two ticks on that *person's* clock.

OK that's where it's getting hard to understand. But when you say that
the time between two observed ticks gets longer, do you include the
doppler effect or is it supposed to be compensed (as for example by
compensating the delay due to the travel of light)?

Because as I understand it, according to what you say, there's a
problem with the twin paradox, because if both twins see each other
clock ticking slower, what happens when they meet again? I mean, in
this paradox, one twin stays on earth, while another does a high speed
trip in space, and when the two meet again on earth the one who stayed
on earth is much older than the one who traveled in space, that's the
problem to me, considering the traveling twin as the center of the
universe, it should be then the non-moving twin who would be the
youngest once the two would meet, because he would be the one traveling
very fast, relatively to the traveling twin. That's why this paradox
kind of prevents me from understanding why there is no "referential".