The tantalizing prospect of a ninth planet in the solar system that could be Earth-like is suggested by a new paper that explores objects in the distant Kuiper Belt.
It's Official: Astronomers Have Discovered another Earth
A new solar system has been found in the Milky Way. All 6 planets
A Second Earth-Like Planet May Exist In The Solar System, Say
Second potentially habitable Earth-size planet found orbiting
Scientists believe an Earth-like planet might be hiding in our
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If another planet existed that was precisely our size and in our
A Second Planet May Orbit Earth's Nearest Neighboring Star
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Japanese scientists find 'Earth-like planet' in our solar system
Nasa find first alien solar system with as many planets as our own
Kindai University