Mike Brown, a scientist at Caltech, says the undiscovered planet is bigger than Earth and orbiting at the most distant reaches of our solar system, according to npr.org.
Brown, an experienced astronomer, previously discovered Eris, a body larger than Pluto that didn't quite make it planethood, and Sedna, a dwarf planet deep in space, according to npr.org.
Click here to read the report on Brown's claims of a new ninth planet.
Click here to follow Daily Voice White Plains and receive free news updates.