On Saturday, August 30, 2025 at 5:20:04 AM UTC-6 John Clark wrote:
On Sat, Aug 30, 2025 at 6:56 AM Alan Grayson <[email protected]> wrote: *The following quote is from Expansion of the universe <https://en.wikipedia.org/wiki/Expansion_of_the_universe?utm_source=chatgpt.com> :* *"The very earliest expansion, called inflation <https://en.wikipedia.org/wiki/Inflation_(cosmology)> saw the universe suddenly expand by a factor of at least 1026 in every direction about 10−32 of a second after the Big Bang. Cosmic expansion subsequently decelerated to much slower rates, until around 9.8 billion years after the Big Bang (4 billion years ago) it began to gradually **expand more quickly <https://en.wikipedia.org/wiki/Accelerating_expansion_of_the_universe>, and is still doing so." * *The following quote is from** Accelerating expansion of the universe <https://en.wikipedia.org/wiki/Accelerating_expansion_of_the_universe>:* *"The accelerated expansion of the universe is thought to have begun since the universe entered its dark-energy-dominated era <https://en.wikipedia.org/wiki/Dark-energy-dominated_era> roughly 5 billion years ago"* *> I never disputed that conclusion; only yours, that it implies that after the galaxies formed, the universe was expanding very slowly.* *Expanding "very slowly" compared with the expansion of the universe during inflation certainly. I will now make a statement that you dispute that I am nevertheless absolutely certain is true: * *Today galaxies are expanding faster than they were before galaxies started expanding faster. * *The reason I would be willing to bet my life on the above statement being true is because all tautologies are true.* *> Sure, after that the expansion slowed due to gravity, but the discovery of the accelerated expansion says NOTHING about the much earlier rate of expansion. AG * *Yet more evidence that you don't read what I write, not even the parts that I underline. * *"Cosmic expansion subsequently decelerated to much slower rates, until around 9.8 billion years after the Big Bang (4 billion years ago) it began to gradually **expand more quickly <https://en.wikipedia.org/wiki/Accelerating_expansion_of_the_universe>, and is still doing so." * *Sorry, but I'm still confused about what, exactly, Hubble's law is telling us. On its face, it's saying that on average, the farther away galaxies are, the faster is their recessional velocity. Does this mean that in the past, after the very short period of inflation ended, and ignoring 1998 measurements, they were receding faster than they are today? TY, 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/805cfa9d-4c18-4ccb-aed1-b063e9c535d5n%40googlegroups.com.
