The number of neutrinos detected coming from the sun is only about a third
of what is predicted by standard solar models. This indicates a lack of
nuclear fusion in the sun, supporting gravitational collapse
theory.
A new, more sensitive neutrino detector has found that the number of
electron neutrinos coming from the sun is less than expected, but the
total number of neutrinos coming from the sun matches predictions.
Apparently, neutrinos are changing flavor en route as a result of
quantum mechanical effects (Ahmad et al. 2002).
Ahmad, Q. R. et al. (SNO Collaboration). 2002. Direct evidence for
neutrino flavor transformation from neutral-current interactions in the
Sudbury Neutrino Observatory. Physical Review Letters 89: 011301.
http://xxx.lanl.gov/abs/nucl-ex/0204008
