The Radiation That Proves the Universe Had a Beginning

The Cosmic Microwave Background (CMB) is faint microwave radiation filling the entire universe, considered the "afterglow" or "echo" of the Big Bang. For the first 380,000 years after its birth, the universe was an incredibly hot, dense plasma where light couldn't travel freely. As it expanded and cooled, electrons and protons combined to form neutral atoms, making the universe transparent. The photons released at this moment, now stretched to microwave wavelengths by the universe's expansion, constitute the CMB.

Discovered accidentally in 1965, the CMB is a cornerstone of the Big Bang theory. It exhibits remarkable uniformity across the sky, with tiny temperature fluctuations. These minute variations are crucial, as they represent the initial density differences in the early universe, which eventually grew into the galaxies and large-scale structures we observe today. Studying the CMB provides invaluable insights into the universe's age, composition (including dark matter and dark energy), and early conditions.

#BigBangTheory #cosmicmicrowavebackground #originoftheuniverse

References:
https://www.esa.int/Science_Explorati...
https://lambda.gsfc.nasa.gov/product/...
https://lambda.gsfc.nasa.gov/educatio...

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