Is There a Black Hole in Our Backyard?
Astrophysicists have recently begun hatching plans to find out just how weird Planet Nine might be.
What is an astrophysicist to do during a pandemic, except maybe daydream about having a private black hole?
Although it is probably wishful thinking, some astronomers contend that a black hole may be lurking in the outer reaches of our solar system. All summer, they have been arguing over how to find it, if indeed it is there, and what to do about it, proposing plans that are only halfway out of this world.
The speculation began back in 2016 when Michael Brown and Konstantin Batygin, astronomers at the California Institute of Technology, proposed that the weird motions of a few ice balls billions of miles beyond Pluto could be evidence of a previously unknown and unsuspected object way, way out there in the dark.
According to their calculations, that object would be roughly 10 times as massive as Earth and would occupy an egg-shaped orbit that brought it as near as 20 billion miles from the sun several times the distance from the sun to Pluto and took it as far as 100 billion miles away every 10,000 to 20,000 years.
https://www.nytimes.com/2020/09/11/science/astronomy-planet-nine-black-hole.html