Monday, June 26, 2017

How many planets?

Eight? Nine? Ten? Eleven?

Arguments about the status of Pluto aside (and some people are obviously arguing that if Pluto counts so does Eris, even Ceres), new research indicates there may not only be one planet-sized object in the outer system.

The "presence" of the new planet may be revealed by alterations in the orbital plane of Kuiper Belt objects. If it exists, it's about the same size as Mars.