There Is *Some* Water Ice on Pluto
New Horizons also spotted evidence of water ice on the distant world. The spacecraft’s Ralph spectral composition mapper detected several regions of exposed ice near the dwarf planet’s Tombaugh Regio region.
Water ice is pretty rare, though. Researchers believe there may be more water ice buried beneath ice flows made from other elements.
“Understanding why water appears exactly where it does, and not in other places, is a challenge that we are digging into,” science team member Jason Cook, of Southwest Research Institute, said in a statement announcing the discovery.