Today was reported a muon detection, from a cosmic ray. Big deal, right; they get detected all the time, that's why we have detectors. This one, though, was special: "KM3-230213A" came from a neutrino collision.
The energy to create that muon was 220 PeV. Yes, that's a P[eta]: 2.20 x 1017 electron volts. Scary.
Annoyingly because this was so record-breaking it is like a "wow signal", because it doesn't come with friends to narrow whence it came. My suspicion, in which I doubt I'm alone, is some quasar from near the Big Bang.
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