Is Planet Nine a Primordial Black Hole?
Scientists at Harvard University and the Black Hole Initiative (BHI) have developed a new method to find black holes in the outer Solar System, and along with it, determine once-and-for-all the true nature of the hypothesized Planet Nine.
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Try this one:
https://www.youtube.com/watch?v=Ln7WF78PolA
Primordial Black Holes, from their very nature of being very small, on the order of the mass of a smaller asteroid and up, would evaporate via the way Hawking described as a unusual back round radiation, similar to the 3.7K radio back round from the Big Bang except in the Gamma ray spectrum.
So far, all studies on this hypothetical radiation have come up empty. They have ruled out this for a large number of possible populations and distributions through the cosmos. One study concluded the average number of these objects would be below 1 solar mass in a region the volume of the Milky Way galaxy. The amount means the possibility of a large one near our solar system is very low.