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From: hitlong@yahoo.com (gharnagel)
Newsgroups: sci.physics.relativity
Subject: Re: Relativistic aberration
Date: Wed, 17 Jul 2024 12:05:26 +0000
Organization: novaBBS
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On Wed, 17 Jul 2024 7:05:15 +0000, Thomas Heger wrote:
>
> Am Dienstag000016, 16.07.2024 um 16:47 schrieb gharnagel:
> >
> > "Why is the speed of light so slow when the universe is such a really,
> > really big place?" -- G. L. Harnagel
>
> This is a tautology:
>
> What we see in the night sky is actually our own past light-cone.

Ah, but if we can develop tachyon astronomy, that will not be true!

> This means: light is relatively slow for the wastness of the universe,
> hence we can see everything only with a certain delay and the further
> away, the longer the delay, according to x = c* t
> (with x= distance in meters, t = delay in seconds).
>
> This 'longer away' is usually measured in light years and the delay in
> years.
>
> Since the night sky shows only a delayed image of past events, the speed
> of light cancels out of the equations and we can put any value into it
> and always get a valid picture of the universe.
>
> So we only assume, that light moves always with ~300 million meters per
> second through the entire universe.
>
> But if light would speed up or slow down, we would not be able to
> measure this, because we always see the own light cone in the night sky
> and c is already embedded into it (for whatever a value c actually has
> in outer space).
>
> TH

Ah, but the fine structure constant, which is pertinent to how stars
shine,
includes the speed of light.  That implies that c is the same throughout
space and time, n'est-ce pas?