How is it possible for cosmic background radiation to still be detected?
i think your confusing lies in the area that you believe that the universe has a center and an edge, therefore if we are expanding away from the center, how come we are still reading cosmic microwave background radiation from the ‘time of last scattering’ when protons and electrons couple to make the first atoms about 400000 after the hot big bang. The Big Bang was not an explosion from a single point, with a center and an edge. Most of the photons are cosmic microwave background photons that were present since the Big Bang but which have been traveling freely only since 400000 years after the Big Bang. These photons always travel at the speed of light relative to the galaxies near them. As the Universe gets older, the galaxies do not expand but the distance between the galaxies gets larger. The photons emitted by one galaxy do indeed spread out through the Universe, but photons from other galaxies can still be seen. summary: cosmic microwaves background radiation are everywhere no mat
