Neutrinos determined where galaxies formed in the early universe


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Neutrinos may be small, but in the early universe they were mighty


In the early universe, neutrinos were king. These tiny particles interact with other matter so weakly that about 100 trillion of them pass through your body unnoticed every second, but they may have had enormous effects on the structure of matter just after the big bang.

In the first few thousand years of the universe, before the formation of galaxies or stars, very small ripples of matter started to form, says Francis-Yan Cyr-Racine at the University of New Mexico. “The way those ripples form depends dramatically on …


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