In 2006 we lost our ninth planet when Pluto was demoted after other small icy bodies were found beyond Neptune. The scientist who helped “kill off “ Pluto’s status is now saying there is a ninth planet out there and it is much bigger.
Dr Mike Brown and his colleague Konstantin Batygin at the California Institute of Technology (Caltech) say they have strong evidence of a ninth which is orbiting beyond Neptune with 10 times the mass of Earth,
Although the team has not directly observed this far flung sphere, they have deduced its existence based on the gravitational effects on other known objects in the region.
The group’s calculations suggest it orbits 50 times farther from the Sun than Earth and that its possible elliptical trajectory would take between 10,000 and 20,000 years to complete one full lap.
NYT Science (@NYTScience) January 20, 2016
The Caltech astronomers have a vague idea where so called “Planet X” ought to be on the sky, and their work is now expected launch a campaign to try to track it down.
Dr Brown and Konstantin Batygin have published their work in “The Astronomical Journal:opscience.iop.org/article/10.3847/0004-6256/151/2/22”.