Our sun generates almost 99% of its energy from a fairly straight forward fusion of hydrogen atoms. Less than 2% of its energy is thought to be generated by a process called the CNO cycle.
Almost 100 years ago two German physicists predicted that large massive stars generate most of their energy from the CNO cycle, which is hydrogen fusion that is catalyzed by Carbon-Nitrogen-Oxygen.
Since there is no practical way to observe fusion inside a star, we can only study the particles and the energy released by the fusion process.
CNO fusion was predicted to release a unique neutrino signature.
Because neutrinos have no charge and almost zero mass, they are really, really hard to detect, and CNO neutrinos are especially hard to detect, at least in part because they are relatively rare in Earth's cosmic neighborhood.
This experiment was carried out in a lab under a mountain in central Italy. A large stainless steel container, filled with an organic compound in liquid form, was used to create and measure CNO neutrino scintillations.
Three USA universities devised a method to purify the liquid organic compound to a level never achieved before, which made the experiment possible for the first time.
The last time I looked, it was considered something like acceleration, but I can't imagine how that could work, even considering additional dimensions and the suspension of time at a black hole. Can you?