On Mon, Feb 3, 2014 at 3:29 PM, Edgar L. Owen <[email protected]> wrote
> The question is why when A gets to the center of the galaxy and stops > That's the key point to remember, A comes to a stop. And during the deceleration process things would no longer be symmetrical, A would see B's clock running Fast but B would see A's clock running slow. So A would have aged less than B. > relative to B that then his clock shows only 20 years passage, but B's > clock shows 30,000+? > Actually if you work out the numbers you find that if A accelerated at one g for 20 years ship time he'd only be 137 light years from Earth. After 40 years ship time A would be 17,600 light years from Earth, and after 60 years ship time A would be 2,480,000 light years from Earth and be at the Andromeda Galaxy, although we on the Earth would have to wait 5 million years to see A's ship get to Andromeda, and unfortunately he'd be going much too fast to stop and sightsee. > > Perhaps you didn't see my similar questions to Brent, to which he has > either been unwilling or unable to reply, about this case. He says it's a > matter of geometry, but neglects to point out that geometry must have its > origin at B's earth bound frame. > You can pick any point of origin and you will get the same answer, but it's wise to pick an origin that makes the mathematics the easiest. John K Clark -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
