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Pluto may have been downgraded from full-planet status, but that doesn't mean it doesn't hold a special place in scientist's ...

Earth' 5-7 times Earth's mass might lurk in the Kuiper Belt, reshaping our solar system. Planet Nine could explain mysterious ...

So things stood for 65 years. Although Pluto's orbit was more elongated than the other planets' (and even crossed the orbit of Neptune—not the kind of thing you would expect a decent planet to ...

In the time Pluto was found, classified as a planet and reclassified as a dwarf planet, it has not completed one orbit. One ...

Things have been a mess since Pluto's demotion. In 2006, the International Astronomical Union (IAU) voted on the definition of a planet. Famously, Pluto no longer met the criteria and was demoted ...

Pluto doesn’t meet this membership criterion because its orbit is peppered with other icy bodies in the Kuiper belt. While space scientists today still argue about Pluto’s rightful place in ...

After a year and a half of moving back and forth between Capricorn and Aquarius, Pluto makes its final entrance into boundary ...