On Saturday, May 31, 2025 at 5:39:19 PM UTC-6 Brent Meeker wrote:
On 5/31/2025 3:22 PM, Alan Grayson wrote: On Saturday, May 31, 2025 at 2:24:00 PM UTC-6 Brent Meeker wrote: And to be clear it was thought that the Hubble parameter was decreasing asymptotically to a constant value. But *even with the Hubble parameter constant* a receding galaxy is slower when it's close and recedes faster as it gets further away. The recession speed is proportional to the distance; that's Hubble's law. Brent *This is confusing. Does Hubble's law hold in a universe where the expansion is speeding up? TY, AG * *Depends on what you mean by the speed of expansion. Hubble's parameter is the expansion speed per distance, so speed is proportional to distance. Hubble's law assumed this to be a constant. Then since every galaxy is moving to a greater distance then every galaxy is speeding up. Brent* *Doesn't that imply that distant galaxies, at earlier times, were moving faster than nearby galaxies, and thus contradicts the fairly recent finding that the rate of expansion is increasing, not decreasing? AG * -- 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/001025df-8653-4ce6-bc36-a455ae973429n%40googlegroups.com.
