This paper has been on Arxiv since nearly a year ago; surprisingly it apparently didn't make HN at the time, even though it did get a bit of publicity then, inc

This paper has been on Arxiv since nearly a year ago; surprisingly it apparently didn't make HN at the time, even though it did get a bit of publicity then, including the MIT technology review[0]. Despite the sense of humor evident in the included to-scale "picture" of a black hole, the paper is quite serious... it may be speculative, but it's science. Also, the authors are not the first to speculate that the OGLE microlensing events could be best explained by a population of primordal black holes[1]. However, Planet 9 could still just easily just be an ordinary planet.. the final point of the paper is that we should look for both, the two requiring different search strategies. Anyway, no matter how plausible or implausible, this post made my day. A mini black hole, close enough that we could send a probe there? How cool is that?! [0] https://www.technologyreview.com/2019/09/30/410/is-planet-9-actually-a-primordial-black-hole/ https://www.technologyreview.com/2019/09/30/410/is-planet-9-... [1] https://arxiv.org/abs/1901.07120 https://arxiv.org/abs/1901.07120