On Friday, July 18, 2025 at 11:34:17 PM UTC-6 Brent Meeker wrote:
On 7/18/2025 6:49 PM, Alan Grayson wrote: *And the farther away it is, the greater is its red shift and recessional velocity. So the recessional velocity seems to be DECREASING with time as the universe expands. * The second does not follow from the first. Further away means later in time. Further away is receding faster. Brent *Let me rephase that; first, consider the model of the universe as an expanding sphere and two separated galaxies on that sphere, say on the equator. As we discussed, it's an effect of geometry that the rate of the separation distance increases depending on the initial separation distance, and the red shift increases as well as the separation velocity. That's as time moves forward. Now we get the same result when we consider time moving backward, as we look backward in time and see the red shift and recessional velocity increasing. There's my dilemma. Whether we go backward or forward in time, two separated galaxies exhibit increasing red shift and increasing recessional velocity. 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/a5aaa66a-b38b-4a94-a155-a2cbb6d7aaa8n%40googlegroups.com.
