On 4 June 2014 11:41, John Ross <[email protected]> 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
