Does any of the leftover radiation from the big bang float down on its own onto Earth? Can you estimate how much?
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It took ~ 380,000 years from the BB event before light could travel in one direction — meaning towards us, Before that time, light travelled only very tiny distances before scattering in wild directions; think herding a million cats in a very large field. The temperature of space kept electrons bouncing around freely. Once the expansion finally was great enough to get the temp down to ~ 3000K, then the electrons suddenly all combined (orbits) with protons. This allowed light to take off and we see it today as the CMBR. The expansion has caused that light’s wavelength to now be in microwaves.Does any of the leftover radiation from the big bang float down on its own onto Earth? Can you estimate how much?