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"Ben Newsam" <ben.newsam@xxxxxxxxxxxxxx> wrote in message
news:at4fp2915jte6qm5m03nn8i79lubkm699c@xxxxxxxxxx
On Sun, 31 Dec 2006 02:29:31 -0800, "Spirit of Truth"
<juneharton@xxxxxxxxxxx> wrote:
"Dirk Van de moortel" <dirkvandemoortel@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote
in message news:E%Mkh.260579$OM2.5696643@xxxxxxxxxxxxxxxxxxxxxxxx
Nothing "happens at a speed of 2c".
The distance between two light signals as mesasured by a third
party observer can increase or decrease at a rate of 2c.
The two physical things that *happen* here, are the light signals
both moving at speed c as measured by that observer.
Yes, Dirk, that's what I said...and the GAP closes at 2c as observed by
the third party observer! So, my Q is still valid.
I hope you do not seriously imagine that a third party observer would
be able to see two light signals rushing towrds each other? And what
sort of concept is a "gap" between those two signals in any case? It
is certainly not something that can be measured, still less
"observed".
Of course the gap can be measured and observed.
The light signals can trigger remote events (*), the distances
to and times of which can be measured any way you like.
One second after sending out the signals, there will be
two events a distance 1 second*2c apart.
Two seconds after sending out the signals, there will be
two events a distance 2 seconds*2c apart.
(*) A signal can partly be absorbed by some recording
device and partly continue its way.
Dirk Vdm
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