On Wednesday, June 11, 2025 at 6:08:13 AM UTC-6 John Clark wrote:
On Tue, Jun 10, 2025 at 10:58 PM Alan Grayson <agrays...@gmail.com> wrote: *>> Velocity is 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.* *Yes.* *> 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 reveal?* *Deny? What are we denying? I don't understand the question. * *For distant galaxies we're observing the past, which shows a large redshift, which means a large recessional velocity in the PAST, but then you conclude that same recessional velocity is occurring NOW, in the present. AG * * I am having difficulty resolving the rapid recessional velocity implied by Hubble's law, whether it's now or in the past. AG* *The "Hubble constant" is a poor name because it's not constant, a better name would be the Hubble parameter. When people speak about the Hubble constant what they usually mean is the rate at which the universe is expanding right now, the symbol for that is H0.* *> If photons have no measured extent, which I think Brent concedes, the model of their "waves" being stretched as the universe expands, does not explain their loss of energy. AG * *Yes it does explain how photons lose their energy as the universe expands because in addition to saying that photons have no measurable extent Quantum Mechanics ALSO says that the formula for finding the energy in a photon is:* *E = hc/λ* *λ is the wavelength, c is the speed of light, and h is Planck's constant. * *And countless experiments have proven that Quantum Mechanics made the correct prediction about how much energy a photon will have. If all this seems very strange that's only because it is, the universe is under no obligation to be understandable by human beings. * *John K Clark See what's on my new list at Extropolis <https://groups.google.com/g/extropolis>* 7ow -- 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 everything-list+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/everything-list/68615867-0cbb-44b0-90a8-918add2b4826n%40googlegroups.com.
