Neutrinos in the Sun . ... But neutrinos are hard to detect. ... News: In a tantalizing recent announcement , an international collaboration of Super-K researchers has now presented evidence that the ghostly neutrinos undergo quantum mechanical oscillations, changing their particle identities and quantum properties over time. Theorists have considered neutrinos to be massless particles but these oscillations would imply that they have a very small (but nonzero) mass. ... NASA Official: Jay Norris. ...