Originally posted by Johnny Boy:
Wow! you have come a long way. You are nearly there. Time dilation is an "illusion" when you look at the time within a reference moving at a constant speed relative to you. Similarly the person moving with a constant speed relative to you will "see" a time dilation within your reference frame. Finally you have grasped the fact that "real time dilation" only occurs within a reference frame when it accelerates (or decelerates). However, there is no "positive" and "negative" time dilation. A clock actually ticks slower when it is accelerated or decelerated; which is the same as the clock finding it in a larger gravitational field. Keep up the good work! We have not "all been wrong". You are finally approaching the truth. Congratulations!!!
then explain why the person going on a high c fraction ship would return younger than his brother. its not an illusion. time does slow down for him, which means that from his perspective the universe speeds up. when he slows down at the end, the universe appears to slow down to normal, but it is really his time that is changing.
