You walk into the club and this guy tells you that he has observed the unusual clustering of orbits for a group of extreme trans-Neptunian objects (eTNOs), bodies beyond Neptune that orbit the Sun at distances averaging more than 250 times that of the Earth. These eTNOs tend to make their closest approaches to the Sun in one sector, and their orbits are similarly tilted. He tells your girlfriend that you are unable to explain their unusual orbits. What do you do?

Keep in mind that in 1781 the planet Uranus was discovered and had an orbit inconsistent with Newton's law of gravity applied to the known solar system. This was explained by the existence of an additional planet Neptune, which was discovered in 1846. However, in 1859 the precession of the perihelion of the planet Mercury was also reported to be inconsistent with Newton's law of gravity applied to the known solar system. This was only explained in 1916 by rejecting Newton's law of gravity and showing Einstein's theory of general relativity to be in precise agreement with the observed difference.

Both solutions came more than 50 years after the discovery of the problems. General relativity is unable to correct for the oribt of Uranus, if Neptune was not included in the model and an additional planet (historically named Vulcan) cannot correct for the orbit of merucry, because it does not exist. Do you spend your time looking for an obscure celestial body orbiting the sun, which may or may not be a primordial black hole, or do you reject Einstein's theory of general relativity, which has been extensively tested and successfully predicted many novel fenomena such as recently discovered gravitational waves?

https://en.wikipedia.org/wiki/Planet_Nine
https://arxiv.org/pdf/1909.11090.pdf
https://en.wikipedia.org/wiki/Tests_of_general_relativity
https://en.wikipedia.org/wiki/Vulcan_(hypothetical_planet)