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Astronomers now doubt there is an undiscovered 9th planet in our solar system
- Cactus2018 6y agoOn the other hand, 'If Planet Nine Is a Tiny Black Hole, This Is How to Find It' https://news.ycombinator.com/item?id=23132488 https://news.ycombinator.com/item?id=23132488 > The black hole in this scenario is neither infinitely massive nor infinitely small... 10 times more massive than Earth and five cm across.