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*
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