Sounds like you have come to terms with neutrinos
EDIT: purloined from Wiki
Neutrinos are
elementary particles. Travelling close to the
speed of light, lacking
electric charge and able to pass through ordinary matter almost undisturbed, their detection is extremely challenging. Neutrinos were once thought to have no
mass, but they are now known to have a minuscule (but non-zero) mass.
Neutrinos are created as a result of certain types of
radioactive decay or nuclear reactions such as those in the
sun, in
nuclear reactors, or when
cosmic rays hit molecules. There are three types, or "flavors", of neutrinos:
electron neutrinos,
muon neutrinos and
tau neutrinos; each type also has an
antimatter partner, an
antineutrino. Electron neutrinos or antineutrinos are involved whenever
neutrons change into
protons or vice versa, in the two forms of
beta decay.
Most neutrinos which pass through the Earth emanate from the sun and more than 50 trillion solar electron neutrinos pass through the human body every second.