PSI in the News: "There may be a Planet 9 out there, but I doubt
it’ll be one of the predicted versions of the planet," says Kat Volk of the Planetary Science Institute in Arizona.
buff.ly/riODKP9
A hidden planet on the edge of our Solar System? Here's why scientists are closer than ever to finding it | BBC Sky at Night Magazine
Could there be a planet X or planet Y on the edge of our Solar System? A look at the search for a new planet orbiting the Sun.
