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Astronomy

The Search for Primordial Neutrinos in the Cosmic Background

Quick fact

The cosmic neutrino background is a faint echo of the Big Bang, released just one second after it began, and today it is the second most abundant particle in the universe, after photons—with about 300 million per cubic meter.

Why this is interesting

Every second, billions of neutrinos that were born in the first second of the universe pass through your body. We know they exist, but we have never actually seen one of these cosmic visitors—why is it so hard?

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The Search for Primordial Neutrinos in the Cosmic Background

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