<P> Through the 1970s , it was widely believed that neutrinos were massless and their flavors were invariant . However , in 1968 Pontecorvo proposed that if neutrinos had mass , then they could change from one flavor to another . Thus , the `` missing '' solar neutrinos could be electron neutrinos which changed into other flavors along the way to Earth , rendering them invisible to the detectors in the Homestake Mine and contemporary neutrino observatories . </P>
<P> Through the 1970s , it was widely believed that neutrinos were massless and their flavors were invariant . However , in 1968 Pontecorvo proposed that if neutrinos had mass , then they could change from one flavor to another . Thus , the `` missing '' solar neutrinos could be electron neutrinos which changed into other flavors along the way to Earth , rendering them invisible to the detectors in the Homestake Mine and contemporary neutrino observatories . </P>
the solution of the missing neutrino problem from the sun 's core was resolved by the discovery of
the solution of the missing neutrino problem from the sun 's core was resolved by the discovery of
neutrinos had mass
neutrinos had mass