Re: The Twin Paradox explained from the moving twin ?

In sci.physics.relativity, G. L. Bradford
<glbrad01@xxxxxxxxxxxxx>
wrote
on Sun, 17 Sep 2006 08:05:06 -0400
<HM-dndgFQdDTp5DYnZ2dnUVZ_u2dnZ2d@xxxxxxxxxxxxx>:
(Sigh)

A traveler is traveling between two stars measured at each end to be ten
light years apart. Any observer on an Earth type planet at star A will
observe star B to be zero minus ten years relative to his own atomic clock
time, thus ten light years distant from him. Any observer on an Earth type
planet at star B will observe star A to be zero minus ten years relative to
his own atomic clock time, thus ten light years distant from him.

The traveler stands beside the observer on the planet at star A and
observes with him star B. They both observe star B to be ten light years
away or zero minus ten years in time relative to star A. The traveler boards
his space supership and takes off for star B.

It takes the traveler two years to get one light year from star A. Star A,

[snip rest of very long-winded diatribe for brevity]

I'm assuming this means v = 0.5 c; this gives a transit time of
about 40 years objective but only 34.64 subjective, plus any
time needed to accelerate to 0.5 c on both ends of the journey.
Since humans find 9.805 N/kg (= 9.805 m/s/s) comfortable and
100 N/kg barely tolerable, one might have to add as much as
1 1/2 to 2 years on each end for purposes of getting up to speed.
The rest of the time is spent in free flight, although one could
spin part of the ship to generate centripetal force.

The best I can do is a hydrogen-boron drive, which in theory
should give v = 0.05 c with a big enough fuel tank. This
gives a trip 400 years subjective, 399 1/2 objective -- and
that's assuming refueling at planet B is possible.

--
#191, ewill3@xxxxxxxxxxxxx
Windows Vista. Because it's time to refresh your hardware. Trust us.
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