Pluto and other large bodies in the Kuiper Belt are surprisingly rich in rock rather than ice. It may be because the early ...

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

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Chiefly, the finding could help explain why Pluto, the largest known object in the Kuiper Belt — a vast region of icy bodies in the outer solar system — is dominated by rock rather than ice.

The 2005 revelation set off a chain of events that led to Pluto’s still-controversial demotion from planet status the following year. But now, just as the Kuiper Belt effectively took a ninth ...

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

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

A Southwest Research Institute-led team combined compositional data of primitive bodies like Kuiper Belt objects, asteroids ...

Members of the International Astronomical Union voted in August to reclassify Pluto as a "dwarf planet." Many astronomers, however, are unhappy with the demotion -- they question its scientific ...