@[email protected] : Unbuilt crewed space projects, phantom islands, alternate history, Muppets, Atomic Age design, weird-looking galaxies, temporary moons of Earth, languages, cartography, the Ediacaran biota, old cutaway diagrams. Canadian with malice aforethought. Baggage Books on DriveThruRPG.

  • 0 Posts
  • 2 Comments
Joined 2 months ago
Cake day: December 11th, 2024
  • Paul Drye@lemm.eetoscience@lemmy.world•Question: how do we know where (what direction, orientation, velocity) neutrinos come from?English
    1·
    8 days ago

    In the case of velocity, all neutrinos move at essentially the speed of light (they have the slightest amount of mass which slows them down, each of the three types of neutrino a different mass compared to the other two but still very, very, extremely low masses). Only neutrinos less than 2 eV are noticeably slower than light, and that’s quite a low energy. The almost-exactly-light-speed has been confirmed by, among other methods, comparing bursts of neutrinos from supernovas and other intense sources to the photons coming from the same sources.

    The photons move at the speed of light by definition and MeV and GeV energy neutrinos show up in detectors at the exact same time down to as close as we’ve been able to measure it (roughly one part in a billion, I think it is).