A recent study introduces the idea of Planet Y, a theoretical world that could explain strange gravitational behavior beyond ...

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

By Will Dunham WASHINGTON (Reuters) -Just as Earth orbits the sun, most planets discovered beyond our solar system orbit a ...

"It is possible that a planet once existed in the solar system but was later ejected, causing the unusual orbits we see today." Astronomers have discovered a massive new solar system body located ...

Pluto has been added to the University of Arizona’s scale-model walking tour of the solar system, but will that be enough to mend the dwarf planet’s broken heart? Not likely, according to a recent ...

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