As the youthful universe congealed under the pull of gravity, matter knotted itself into galaxies, galaxy clusters and filaments, weaving a dazzlingly intricate cosmic web. This web’s structure is thanks, in part, to the handiwork of neutrinos — lightweight, subatomic particles that surge through the cosmos in unimaginable numbers.
Because they streak about at high speeds and rarely interact with other matter, the particles weren’t easily caught in the gravitational molasses of that latticework. So their presence swept away the cobwebs, hindering the formation of fine details in this cosmic filigree.
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