On 6/10/2025 7:58 PM, Alan Grayson wrote:
On Saturday, June 7, 2025 at 6:28:41 AM UTC-6 John Clark wrote:
On Sat, Jun 7, 2025 at 8:05 AM Alan Grayson <[email protected]>
wrote:
*>> The James Webb telescope recently found a galaxy that
had a red shift of 14.44, from that number astronomers
calculate that it took light 13.5 billion years to reach
us, so we're observing how that galaxy looked 13.5 billion
years ago. However during that 13.5 billion years the
universe has not only been expanding it's been
accelerating, so back then the universe was expanding
slower not faster than it is now. Today that galaxy is not
13.5 billion light years from us, it is 34.7 billion light
years from us. Even if we could travel at the speed of
light we could never reach that galaxy in a finite number
of years, and any galaxy that has a red shift greater than
1.8 is forever out of our reach.*
/> You say we're observing how that galaxy looked 13.5 billion
years ago,/
*Yes.*
/> but that the redshift being observed today, gives us the
recessional velocity today?/
*Not exactly.Velocityis about objects moving through space, but
the redshift tells us how much space itself has been expanding.*
*The redshift gives us a combination of expansion of space and the
recessional velocity through space. *
*That's assumed to be zero.
*
*But since we're observing the galaxy as it was, about 10 billion
years ago, how can we deny that it's now receding at near light speed
if that's what our measurements plainly r**eveal? *
*No one denies that. The galaxy is further away now and receding faster
now and hence still obeying Hubble's law.
*
*I am having difficulty resolving the rapid recessional velocity
implied by Hubble's law, whether it's now or in the past. AG*
*The movement through space can never be faster than the speed of
light**nor can we communicate faster than the speed of light, but
space itself is free to expand at any speed.*
/> Seems contradictory. AG /
*It's not.13.5 billion years ago when that light was emitted it
was in the ultraviolet, but during its journey space has been
expanding, so the wavelength of the light has been expanding, so
now the light is in the infrared not the ultraviolet. *
*If photons have no measured extent, which I think Brent concedes,
th**e model of their "waves" being stretched as the universe expands,
does not explain their loss of energy. AG
*
*They have extent in the direction of travel.
Brent*
--
You received this message because you are subscribed to the Google Groups
"Everything List" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion visit
https://groups.google.com/d/msgid/everything-list/d37a73c6-5e2f-4046-922f-65a65d7933c4%40gmail.com.
