Heterodox
The universe was born in light. If modern cosmology is right, for the first forty thousand years or so after the Big Bang the most important component in the young, hot universe was electromagnetic radiation, a situation that continued until the universe had cooled sufficiently for the first hydrogen and helium atoms to form. Temperatures were still high enough at that point for the cosmos to be filled with an opaque, glowing plasma. After a few hundred thousand years, as the universe...
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