On Fri, Jan 31, 2020 at 1:18 PM Alan Grayson <[email protected]> wrote:
*> Why difficult? I'm just pointing out an inconvenient fact; namely, if > you use the CMBR as a clock (inconvenient to be sure since the temperature > decline of the CMBR is exceedingly slow), simultaneity for all observers in > all galaxies exists to one part in 100,000. What are the implications? AG* If you are heading for the Andromeda Galaxy at 99.999% the speed of light then to you the CMBR would not look even remotely symmetrical, one hemisphere would look much brighter than the other, which would indicate that you and everything in your spaceship, including your clock and your brain, were moving at a very different speed than most of the matter in the universe. But so what? Time dilation would still be in effect, when you used your telescope to look at the Earth (which happens to be moving at a speed closer to the average speed of matter) you'd see things back on Earth were moving at only 0.4472% the speed they are on your spaceship (assuming 99.999% of light speed). And when observers on Earth look at you they'd see that you and everything on your spaceship were were moving at only 0.4472% the speed they are on Earth. Both would see the other moving slowly. And none of this has anything whatsoever to do with the CMBR, both see that it takes the other 237 seconds to do things that only takes them one second to do. As I said before this is odd but not a logical paradox because of the disagreement among observers over the meaning of "now". This is explained in more detail in the videos on the Twin Paradox that I recommended yesterday, the ones you refused to look at because you thought they were irrelevant. John K Clark -- 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/CAJPayv0y%2B0-%2B0x8gbQ%2BuhizU6uQJVtz%2BPjLOmS%3D3rRruuLVDKQ%40mail.gmail.com.
