On Wednesday, January 22, 2020 at 1:34:00 PM UTC-7, Lawrence Crowell wrote: > > On Wednesday, January 22, 2020 at 11:33:04 AM UTC-6, John Clark wrote: >> >> On Wed, Jan 22, 2020 at 12:06 PM Lawrence Crowell < >> [email protected]> wrote: >> >> > *It is then possible to have an expanding accelerated cosmos that is >>> spherically closed.* >> >> >> So if I keep going I will eventually return to where I started even >> though everything is constantly getting more distant from me and is doing >> so at an accelerating rate? >> >> John K Clark >> > > For an accelerated expansion of the sphere there is a cosmological horizon > that one can't cross. in other words, the sphere will keep expanding faster > than you can ever go. Think of the scene in the movie "*The Shining*" > with Jack Nicholson where the hotel hallway telescoped away faster than he > could run. > > LC >
I don't think it depends on acceleration. As long as the universe expands, even at a constant rate, at some distance, the distance between, say, an Earth observer, and some terminal point along a line of sight, will exceed 300,000 km (the distance light travels in one second) and points beyond that will keep increasing the increment every second, creating a cosmological horizon that light cannot cross. This is because the creation of the horizon is purely a geometric effect of the expansion, and the rate of expansion is irrelevant. 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 on the web visit https://groups.google.com/d/msgid/everything-list/928bfcb1-8892-4858-a5d3-c2e6297c0256%40googlegroups.com.
