About 60 billion neutrinos pass through each square centimeter of Earth every second.
Notes on verification
Well-corroborated by multiple physics education and research sources (Fermilab, Symmetry Magazine) citing standard solar model neutrino flux calculations, confirmed by experimental detections at Super-Kamiokande, SNO, and Borexino. The '60 billion' figure is a reasonable rounding of the commonly cited ~65 billion value.
Sources
- Un neutrino éblouit l’astrophysique | CNRS Le journal (lejournal.cnrs.fr)
- https://www.symmetrymagazine.org/article/june-2015/five-facts-about-neutrinos (symmetrymagazine.org)
- https://neutrinos.fnal.gov/facts/ (neutrinos.fnal.gov)
- https://www.forbes.com/sites/startswithabang/2018/09/25/ask-ethan-how-many-neutrinos-are-in-the-universe/ (forbes.com)