The Universe reveals its magnetism
Cosmologists are learning how to map invisible magnetic fields that pervade the Universe, including the giant voids that separate the largest clusters of galaxies. The fields could have arisen in the first instants after the Big Bang, and are “curved every which way, like a ball of yarn”, says astrophysicist Tanmay Vachaspati; this curvature could reveal details of the physics of the fundamental forces. Primordial magnetism could also help to explain an apparent discrepancy in measurements of the Universe’s rate of expansion.
Quanta | 10 min read
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