On the other hand, 'If Planet Nine Is a Tiny Black Hole, This Is How to Find It'
<a href="https://news.ycombinator.com/item?id=23132488" rel="nofollow">https://news.ycombinator.com/item?id=23132488</a><p>> The black hole in this scenario is neither infinitely massive nor infinitely small... 10 times more massive than Earth and five cm across.