Damien Broderick,
I'm glad you mentioned the "missing neutrinos" belief! This led to scientific scenarios ranging from a black hole in the Sun (as the ultimate source of the fusion) to a "dying sun"; and the science fiction seems to have moved accordingly--Clarke's SONGS OF DISTANT EARTH has the Solar System wiped out by a dying sun traceable to the missing neutrinos, IIRC. I think it is consciously used by Wolfe in the Urth Cycle--a clever "science retro-fit" of Zothique/The Dying Earth, using off-the-shelf items.
And recent news, "Neutrinos have mass!" (Picture them in their itty bitty little pews.) Science marches on!
=mantis=