Janna Levin
@jannalevinastro.bsky.social
Theoretical Physicist. Astrophysicist. Book lover and writer. Professor Barnard/Columbia. Founding Director of Sciences @PioneerWorks, Founding editor-in-chief of Broadcast. Co-host of @quantamagazine podcast "The Joy of Why"
I haven't looked carefully enough at the calculations, but I suspect as long as it's planetary sized, so much smaller than a solar mass, a black hole could be the ninth planet. Some people have suggested planetary scale black holes formed earlier in the universe and also contribute to dark matter
July 10, 2025 at 2:51 PM
I haven't looked carefully enough at the calculations, but I suspect as long as it's planetary sized, so much smaller than a solar mass, a black hole could be the ninth planet. Some people have suggested planetary scale black holes formed earlier in the universe and also contribute to dark matter