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By contrast, Earth's diameter is about 7,900 miles (12,800 kilometers).
Despite its size, the planet will probably have a far lower density than Earth, the researchers think.
Earth has iron at its core, but if Planet X formed in the outer reaches of the solar system, it will have stone at its center and a mantle of ice.
Originally posted by ElectricUncleSam
Are there people out there who still think Planet X is a hoax or is made up? I honestly have not made up my mind, but it seems as if science is beginning to uncover evidence which may prove whether it exists...