"Planet Nine" is a long-theorized super-Earth at the edges of the solar system. New research suggests it's not a planet but a gigantic disk of small bodies.
Jackson Ryan, CNET
Mon, 01/21/2019 - 9:22pm
"Planet Nine" is a long-theorized super-Earth at the edges of the solar system. New research suggests it's not a planet but a gigantic disk of small bodies.