...the supernovae might have caused a 20-fold increase in irradiation by muons – an unstable subatomic particle of the same class as an ...creature inhabiting land or shallower parts of the ocean. Muons make up much of the cosmic radiation reaching the ...
... so early after the Big Bang. This is to do with how the antineutrino in less inclined to change 'flavour' (from a muon to an electron flavour) compared with its neutrino counterpart Not only that, but as neutrinos travel practically unhindered...