On Tuesday, September 17, 2024 at 5:36:05 AM UTC-6 John Clark wrote:
On Mon, Sep 16, 2024 at 7:31 PM Alan Grayson <[email protected]> wrote: > *when we approach the observable event horizon, the spatial expansion is still increasing less than c,* *Yes. Obviously you will not be able to see any stars receding from you faster than c. * > *so I don't see how the observational event horizon is 46 BLY. AG * *If you are 5 billion light years away from me then in one direction you will be able to see stars that I cannot see, but in the opposite direction I will be able to see stars that you cannot see. And If you see the light from a star that has travel for 13.8 billion years before entering your telescope and then you get into a spaceship that travels at 99.999% the speed of light for 13.8 billion years, you will still be nowhere near that star, and if you travel for 46 billion years you will STILL be nowhere near that star, although you will be able to see many stars that I cannot see, but you will not be able to see any of the stars that I, who has remained on the Earth, can currently see. * *> the observable universe, space is expanding at a rate less than c. Correct? So the 46 BLY distance doesn't seem right. * *Even if you forget about General Relativity, and even if you forget that the universe is accelerating, we've known for a century that the universe is expanding, so if you're looking at a star as it was 13.8 billion years ago then even Newton would say that by now that star is much further away than 13.8 billion light years. * *I agree. But my problem is that 46 BLY seems too large. It seems to imply the expansion rate is greater than c in the observable universe. AG* *fa* -- 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/bc95df75-6023-4518-9c6c-5aacca6eef27n%40googlegroups.com.
