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That's not what the CMB is. The CMB is an incredibly uniform pattern which appears to have been formed by a very hot plasma at some point in the past. It's diff
by cyphar 5y ago
That's not what the CMB is. The CMB is an incredibly uniform pattern which appears to have been formed by a very hot plasma at some point in the past. It's difficult to imagine an explanation other than the Big Bang (or some kind of expansion of a very hot plasma) because the uniformity means it was almost certainly concentrated in space.
But yes, in the distant future, it will not be possible to detect the CMB anymore (and it's entirely possible that alien civilisations that evolve at that time would probably never have a model of the Big Bang because there would be no remaining evidence of it).
- cheese_van 5y ago...and the galaxies will have drifted so far apart, that nothing will appear to exist beyond their own galaxy, except dust.
- throwawaycities 5y ago> That's not what the CMB is. The CMB is an incredibly uniform pattern which appears to have been formed by a very hot plasma at some point in the past. I understood that the CMB is not photons from plasma but the first photons following recombination (when the universe cooled enough that electrons and protons formed first hydrogen atoms). In other words the universe was plasma just before the CMB.
- cyphar 5y agoYes, you're quite right -- sorry for not being precise enough. However my point was that the fact that we cannot see beyond the CMB and the uniformity of the pattern both point towards a Big Bang-esque explanation.