Robert Lea is a science journalist in the U.K. whose articles have been published in Physics World, New Scientist, Astronomy Magazine, All About Space, Newsweek and ZME Science. He also writes about science communication for Elsevier and the European Journal of Physics. Rob holds a bachelor of science degree in physics and astronomy from the U.K.
A good alternate theory is that there is one or more small black holes in the Kuiper Belt, with event horizons the size of a tennis ball. So absent a very rare collision, it's invisible to us. From Wikipedia article on primordial black holes:
"In August 2019, a study was published opening up the possibility of making up all dark matter with asteroid-mass primordial black holes ." "In September 2019, a report by James Unwin and Jakub Scholtz proposed the possibility of a primordial black hole with a mass 5–15 M🜨 , about the diameter of a tennis ball, existing in the extended Kuiper Belt to explain the orbital anomalies that are theorized to be the result of a 9th planet in the solar system."
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