It turns out that large-scale dark matter detectors like XENONnT can detect thermal solar neutrinos—low-energy particles continuously emitted by the Sun's plasma. By analyzing only the ionization signal (S2), scientists set an upper limit on their flux: no more than 120 million times higher than the Standard Model prediction. While not a discovery yet, this result confirms for the first time that low-threshold detectors can serve as tools to study the most elusive neutrinos in astrophysics. In the future, the XLZD experiment will improve sensitivity by orders of magnitude. Imagine a camera that sees individual photons—these detectors similarly count the rare electrons knocked out by neutrinos.
Dark matter detectors are like microphones of incredible sensitivity, able to hear a whisper in the roar of a rock concert. They search for rare nudges from dark matter particles. But in a new study, scientists tuned these microphones to a different sound—the faint “rustle” of solar neutrinos. Neutrinos are ghostly particles that pass through everything unhindered. Every second, a hundred billion of these “ghosts” fly through your fingernail, and you feel nothing. Ordinary neutrinos are loud, but these, born from the heat of the Sun, are almost noiseless: their energy is a thousand times less.
When a neutrino glances off an electron, the microphone picks up a flutter—as if a tiny membrane swayed from a breath. The signal hasn’t been caught yet, but it’s already clear: the same instruments that search for the universe’s invisible matter can peer into the blazing heart of a star. The irony is that a machine built to hunt the most mysterious substance can now tell us how ordinary solar plasma boils. A new generation of microphones will sharpen this picture.
🎯 Neutrinos flee the Sun’s core in a couple of seconds, while the light we see takes tens of thousands of years to struggle out.