- A Radical Hypothesis Says Planet Nine Could Be a Black Hole. Here's How to Find Out https://www.sciencealert.com/is-planet-9-actually-a-grapefruit-sized-black-hole-here-s-how-to-tell 3 comments worldnews
Linked pages
- https://www.cfa.harvard.edu/news/2020-13 36 comments
- Supermassive black hole - Wikipedia http://en.wikipedia.org/wiki/Supermassive_black_hole 22 comments
- Vera C. Rubin Observatory - Wikipedia https://en.wikipedia.org/wiki/Vera_C._Rubin_Observatory 3 comments
- More Evidence that Planet 9 is Really Out There - Universe Today https://www.universetoday.com/141644/more-evidence-that-planet-9-is-really-out-there/#more-141644 3 comments
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