On 5/31/2025 9:00 PM, Alan Grayson wrote:
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*
*Distant galaxies recede faster than nearby galaxies at all times. ** *
*, and thus contradicts the fairly recent finding that the rate of expansion is increasing, not decreasing?*
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