Re: Twin paradox revisited ll

"bill" <cosmosco@xxxxxxxxxxxxxxx> wrote in message
news:1184981064.527191.20310@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
No I would not. I cannot accept that the traveler *really* believes
that the earth is orbiting the sun at around 1m-s nor do I believe
that this is what would 'really' be happening.

What has the belief of some astronaut got to do with the physics?

During the acceleration the situation is much more
complicated but the answer is essentially the same.

As regards whether it is 'physically' happening, I cannot
answer this question unless you define exactly what you
mean 'physically'.

By 'physically' I mean the concept that the earth is 'really' orbiting
the sun at 1m-s as distinct from 'apparently' as determined by the
traveller.

In the traveller iFoR it is

It has nothing whatsoever to do with what *we*, as stay at home
observers observers, think but what is claimed the *traveler*
determines is reality.
Yes, for the traveller.
So he *really* believs that the earth is *physicaly* orbiting the sun
at 1m-s?

It is .. in his iFoR

What we can tell is that, when the two twins meet up, the travelling
twin has aged less than the earthbound twin.

One could argue that inertial clocks run as quickly as possible
and that the best way of describing what has happened is
to say that the non-inertial (travelling) twin's clock has been
slowed down.

Other than what one 'could argue' I fully agree with those comments
but I cannot agree, as expressed above, that the stay at home
*physically* ages at the faster rate thus that the traveler could
obliterate all life on earth by taking his foot off the gas pedal.

You need to define 'physically'.

That the traveler destroys all life on the planet.

He destroys nothing .. it just happens over the long period of time that
elapses on the earth

When he returns
home he learns - hopefully - that this has not *physically* taken
place.

But it has

The fact that the traveler finds on his return that everything is
'normal' back here - that life continues - should indicate to him that
the earth had *not* been orbiting the sun at near light speed, that
what he saw or determined was nothing more than a visual illusion
generated by his rate of travel.

No, it indicates that the passage of time is not universal. Of course,
on his return, the traveller will be aware that, from the earthbound
twin's point of view, nothing unusual has happened.

Having 'believed' that all life on the planet has been obliterated it
would not only be 'from the earthbound twin's point of view, nothing
unusual has happened' but also from the *traveler's* point of view.

It really happens

The bit you have not grasped is that the passage of time is not
universal. This is very counterintuitive but it is the inescapable
conclusion of experiment.

Or rather, in the *interpretations* of those experiments. As far as I
am aware there has been no experiment which proved that from the
traveler's point of view it is his twin that ages at the faster rate
than himself.

Time dilation is experimentally proven .. time goes slower for moving
objects.


.

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