So, as I explained yesterday, we’ve got this hydrogen plasma that traps light. This creates an opaque fog that covers the universe. But then when the temperature of the universe dropped, the electrons bonded to the protons to form hydrogen atoms and the light was freed up to move around. The picture from yesterday of this phenomenon is not really accurate in that things would be a lot more expanded and the light would move around much more without hitting anything. So what you have is basically a bunch of photons flying around in free space without anything to bounce off of. They have the same properties and distributions as they did when they were first set free. So now we can take a look at them. We sent out some satellites and they measured photon intensities at different locations and the picture up top is the kind of thing we got.
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