On 8/16/2025 12:27 AM, Alan Grayson wrote:
On Monday, August 11, 2025 at 10:21:16 PM UTC-6 Alan Grayson wrote:
On Sunday, August 10, 2025 at 8:23:53 PM UTC-6 Alan Grayson wrote:
On Sunday, August 10, 2025 at 5:51:31 AM UTC-6 John Clark wrote:
On Sun, Aug 10, 2025 at 6:01 AM Alan Grayson
<[email protected]> wrote:
On Saturday, August 9, 2025 at 5:45:01 AM UTC-6 John
Clark wrote:
*Until very recently the most distant object our
telescopes can see had a redshift of about 14, but
very recently there are reports that the James
Webb telescope has seen point-like objects that
seem to have a redshift of 25! Whatever these
objects are they contain little or no dust as
you'd expect because dust requires elements other
than hydrogen and helium which need to be made in
stars, but if we really are looking at an object
that has a red shift of 25 then we're looking at
something that existed before stars did. If
confirmed that would be a pretty profound
discovery, and about the only thing that could
explain them are Primordial Black Holes created
during the first nanosecond after the Big Bang.*
**
*JWST Found Objects at Insane New Distances
(Redshift of 25?!)*
<https://www.youtube.com/watch?v=saL_1R1WitA&t=797s>
*/> How is the red shift related to the velocity of
light? How large must it be to equal c? TY, AG /*
*Because space is expanding and accelerating, galaxies
that have a redshift greater than about 1.7 are today
moving away from us faster than the speed of light, so we
can never reach them or even send a message to them, they
are beyond our causal horizon; however today we can still
see them because at the time the light from them was
emitted the galaxy was closer to us than it is now, and
back then it was receding away from us slower than it is
now, slower than the speed of light. For the same reason
today we can even detect the Cosmic Microwave Background
even though ithas a redshift of about 1100, but we could
never send a message or influence anything that happens
that far away.*
*John K Clark See what's on my new list at Extropolis
<https://groups.google.com/g/extropolis>*
TY. If it's not too much trouble, can you show me how you do
that calculation? AG
What is the physical interpretation of the huge red shift of the
CMB? It can't mean extreme recessional velocity since it's here,
everywhere, in every direction. AG
Since the CMB isn't receding, what is the physical interpretation of
its huge red shift? AG
It's all relative. We're receding, if you insist on "somebody is
receding". The bit of the CMB we see is a further away bit every day.
Its photons have traveled to us thru space that has been expanding as
they traveled.
Brent
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