On 6/1/2025 12:02 AM, 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
*Isn't the increasing recessional speed of distant galaxies purely a
geometric effect of the expansion of the universe? A long time ago, as
I recall, that was your argument, and//I recapitulate it by imagining
points on an expanding sphere. AG*
*Yes, it's primarily a geometric effect that speed increases with
distance. The recent discovery that speed increases with time modifies
this slightly since we observe nearer galaxies later in time.
Brent*
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