3 ms·
If you stretch out the CMB across the volume of the entire universe, it seems plausible it would be pretty faint. That r^-3 term on the energy density is prett
by marginalia_nu 3y ago
If you stretch out the CMB across the volume of the entire universe, it seems plausible it would be pretty faint. That r^-3 term on the energy density is pretty small when r is of order ~100 billion ly or more.
- pfdietz 3y agoAnd there's another factor of r from the redshift of those photons.