Science
Is the universe twisted? A new check on a possible twist in the universe's oldest light
The cosmic microwave background (CMB) is the universe's oldest light, leftover thermal radiation from about 380,000 years after the big bang. Maps of the CMB offer a picture of the "baby universe" as it was 13.8 billion years ago.
AI Summary
The cosmic microwave background is the universe’s oldest light, a relic of thermal radiation emitted roughly 380,000 years after the big bang. Maps of this background provide a view of the “baby universe” as it existed 13.8 billion years ago. At that epoch, scattering of radiation by free electrons produced a faint linear polarization when the universe first became transparent.
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