One piece of evidence is lacking from astronomers’ theory of thermonuclear fusion within stars.
Thermonuclear fusion, which creates solar energy, releases a great quantity of subatomic particles called neutrinos.
Huge numbers of them ought to come from the Sun.
After careful experimentation, however, astronomers have found only 10 percent of the neutrinos they expected.
The fact that neutrinos are missing from the Sun leaves a big question mark.
As a result, astronomers have to consider that they may be wrong about what happens inside the core of a star.