Starts With a Bang podcast #119 — The CMB | by Ethan Siegel | Starts With A Bang! | Jul, 2025

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This image shows the Large Aperture Telescope’s colossal, 6-meter primary and secondary mirrors at the Simons Observatory in February of 2025. The telescope has already seen first light, and will soon begin delivering new CMB science as never before. (Credit: M. Devlin/Simons Observatory)

The relic signal that first proved the Big Bang has been known and analyzed for 60 years. Join us at the frontiers of modern cosmology!

Perhaps the strongest evidence we’ve ever acquired in support of the Big Bang has been the discovery of the leftover radiation from its early, hot, dense state: today’s cosmic microwave background, or CMB. While there were many competing ideas for our cosmic origins, only the Big Bang predicted a uniform, omnidirectional bath of blackbody radiation: exactly what the CMB is.

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