Ground telescopes capture 13-billion-year-old light from universe’s birth in a first

undefined 12, 2025

Source: interestingengineering

From a mountaintop in Chile, scientists have achieved a first: measuring the Big Bang’s faint polarized light from Earth. Using the CLASS telescope, Johns Hopkins researchers detected how the universe’s earliest stars scattered ancient microwave signals, revealing key details about the "Cosmic Dawn" over 13 billion years ago. The breakthrough offers new insight into the universe’s first moments—once thought only possible to observe from space—and sharpens our understanding of dark matter, neutrinos, and the formation of the cosmos.

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