by Chicken_Little » Tue 02 Jan 2007, 21:49:55
$this->bbcode_second_pass_quote('PenultimateManStanding', 'I')'ve got one that always puzzled me: how come if a twin goes up in space and flies at great speed relative to the earth and comes back a long time later, his twin on earth has aged more than him? isn't speed relative? if there is no absolute speed, then wouldn't the twin on earth be speeding fast relative to the twin in the spaceship? I get the idea of time in a gravity well, but the relative speed thing always stumped me.
if one twin were wearing frictionless ideal rollerskates standing on a conveyor belt moving at half the speed of light while wearing an ideal spacesuit which preserved his life, and the other twin were standing next to the conveyor belt, would one twin age faster than the other?