On 4 June 2014 11:41, John Ross <jr...@trexenterprises.com> wrote: > We are not at the center of the universe, at least I have no reason to > believe we are. > > That is the implication of the universe being surrounded by a shell of particles that appears to be equidistant from us in all directions.
> > > The shell in not the CMBR. It is mostly cold electrons and positron > traveling at their natural speed of about 2.19 X 106 m/s. > You will have to explain more about this shell. My image of a shell is of a hollow sphere. As far as I know the CMBR measurements indicate that it looks the same in all directions to within a very high accuracy. If it's a shell that seems to imply that we're at the centre of it. (Also, by the way, I wouldn't consider particles travelling at 1% of c to be "cold") > > > The photon pressure is very uneven. For galaxies at the center of our > Universe the photon pressures cancel. But if we are near the edge of our > galaxy and looked at a galaxy at the center of our Universe it would appear > to be moving away from us. > So what about the known effects of photon pressure - that it accelerates light material and leaves the heavy stuff behind? Why haven't all galaxies been stripped of hydrogen gas by this? > > > My understanding of the CMBR it is cosmic microwave radiation. And that > it includes only radiation not in the microwave and radio frequencies. Am > I wrong? > Yes you are. (Unless you said "not" by mistake). The CMBR is mainly microwaves, as shown here, most of its energy is at wavelengths between 0.5 to 0.05 cm > > > My understanding of an integrating sphere is that the radiation in it is > invariant with respect to direction. Isn’t this true for the CMBR? > > > So is that your explanation for the isotropy? OK, that might make sense. (But you still have to explain why the *number* of galaxies appears to be the same everywhere between us and this sphere if we aren't at the centre.) -- 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 everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
