This explains in an understandable way why we only see “back” to CMB, not all the way to the Big Bang. Helpful.
For such a small chapter, this week’s topic on Cosmology has some large and deep concepts. I’m attempting to delve into “How did the period of inflation cause the universe to become homogeneous and isotropic?”
Big Bang ~ Universe began as an extraordinarily hot, dense primordial atom of energy and caused expansion, just like an explosion. Before that moment, nothing existed, not even space and time. Rather, the explosion created spacetime, which continues to expand. (Comins, 446)
Cosmic microwave background (CMB) ~ If the universe began with a hot Big Bang, then calculations indicated the energy remnants should still fill all of space today. The entire universe’s temperature should be only a few kelvins above absolute zero. This radiation’s blackbody spectrum peak should lie in the microwave section of the radio spectrum. (Comins, 446)
Isotropy of CMB ~ The cosmic microwave background radiation is almost perfectly isotropic…
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