The majority of these wer
The majority of these were created during the first few fractions of a second after the big bang, when the universe was comprised of elementary particles. These particles were first postulated to preserve conservation of energy, conservation of momentum, and conservation of angular momentum in beta decay. Although their speed was generally assumed to be equal to the speed of light, MINOS detectors have since found the value to be much smaller. These particles are spawned from background radiation, the interaction of cosmic rays with the Earth's atmosphere, and nuclear fusion. Their existence was postulated by Wolfgang Pauli in 1930, and their name was coined by Enrico Fermi. FTP, name this chareless particle which can be found in 3 distinct flavors: electron, muon, and tau.
The majority of these were created during the first few fractions of a second after the big bang, when the universe was comprised of elementary particles.
{Neutrino}