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Re-Examined IceCube Data Firms Up Case For Extra-Galactic Neutrinos
In 2013, the IceCube neutrino telescope detected dozens of high-energy neutrinos. Now, reports Astronomy magazine, researchers "have sorted through the billions of subatomic particles that zip through its frozen cubic-kilometer-sized detector each year to gather powerful new evidence in support of [those] 2013 observations confirming the existence of cosmic neutrinos." According to the report, Albrecht Karle from UW-Madison notes that while the neutrino-induced tracks recorded by the IceCube detector have a good pointing resolution, within less than a degree, the IceCube team has not observed a significant number of neutrinos emanating from any single source. ... “The plane of the galaxy is where the stars are. It is where cosmic rays are accelerated, so you would expect to see more sources there. But the highest-energy neutrinos we’ve observed come from random directions,” said Karle. “It is sound confirmation that the discovery of cosmic neutrinos from beyond our galaxy is real.”
As of right now, the only confirmed neutrino sources we have that aren't artificial are the sun and SN 1987A
Don't forget atmospheric neutrinos. These are created in the showers produced when cosmic rays strike the upper atmosphere. Since they pass through the planet you detect them from all over the globe. The Earth itself is also a natural source of neutrinos from radioactive decay and there are some experiments, such as SNO+, that are looking for these 'geo-neutrinos'.