Astrophysical neutrinos have so much energy they may as well travel at the speed of light.

The full stream where this video comes from: https://www.youtube.com/watch?v=wXanvTls3Xs

Trenches of Cosmology live-streams: https://www.youtube.com/channel/UC570WrRn_tBSK1tU1TzOcAA

Astrophysicalneutrinosenergy