NEW YORK (AP) — A new Tatooine-like planet outside the solar system may orbit two failed stars, scientists reported Wednesday. Located about 120 light years away, the exoplanet appears to take an ...

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

Is there a massive undiscovered planet on the outer reaches of the Solar System? The idea has been around since before the discovery of Pluto in the 1930s. Labelled as planet X, prominent astronomers ...

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Planet Y has not been directly observed, but its influence is apparent. Researchers studied roughly 50 icy objects beyond Neptune and found unexpected orbital inclinations.