On October 6 1995, at a scientific meeting in Florence, Italy, two Swiss astronomers made an announcement that would transform our understanding of the universe beyond our solar system. Michel Mayor ...

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

Mike Brown is convinced that beyond Neptune, at the far reaches of our solar system, there's an unseen giant planet. "This is the 5th largest planet in our solar system, lurking out there, waiting to ...

A recent study introduces the idea of Planet Y, a theoretical world that could explain strange gravitational behavior beyond Neptune. Published in Monthly Notices of the Royal Astronomical Society: ...

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