3 ms·
6.3 PeV - that's crazy! Wolfram Alpha tells me that'd be about enough energy as work to depress a key on a keyboard.
by lainga 6y ago
6.3 PeV - that's crazy! Wolfram Alpha tells me that'd be about enough energy as work to depress a key on a keyboard.
- lokimedes 6y agoNow that would be spooky action at a distance.
- Sharlin 6y agoNot only that, but a neutrino of that energy! Its speed must have been ridiculously close to c, rather than "only" extremely close to c like almost all other neutrinos.
- smueller1234 6y agoAnother impressive one: Ultra high energy cosmic rays have been detected to 3e20 eV (300 EeV; detected by the Fly's Eye Collaboration). They're nuclei, however, so the rest mess is at least about 10000x higher. https://en.m.wikipedia.org/wiki/Ultra-high-energy_cosmic_ray https://en.m.wikipedia.org/wiki/Ultra-high-energy_cosmic_ray If you're interested in popular science but haven't read about this before, consider following the link to the GZK cutoff from that page. It's super cool. I used to work for the Pierre Auger Observatory. Happy to try to answer any questions if folks are curious. :)
- caf 6y agoIsn't the rest mass of a proton at least 8 billion times higher than that of a neutrino?
- smueller1234 6y agoYou're right. Oof, I need to stop reading HN late at night when I can't even read units wrong or have any intuition. Apologies.