Pluto as seen from NASA's New Horizon's satellite | NASA/JHUAPL/SwRI

Pluto May Have Formed From a Billion Comets

The planet’s chemical makeup appears to have been formed from comets and other Kuiper Belt objects, according to research on its vast nitrogen-ice glacier Sputnik Planitia.

Comet 67P/Churyumov-Gerasimenko, photographed by the European Space Agency's Rosetta spacecraft. | ESA/Rosetta/NAVCAM