I wonder if #PlanetNine will be discovered (again—I still remember you #Pluto!) in our lifetime‽
The #math says it’s there (just like it confirmed #Neptune’s existence), but I still wonder if it could be a brown dwarf instead.
https://www.sciencealert.com/a-giant-planet-seems-to-be-lurking-somewhere-in-our-solar-system
We could also have a tiny #BlackHole orbiting our solar system (which would be awesome & scary).