Ancient Pluto May Have Had Lakes And Rivers Of Nitrogen

The New Horizons probe revealed the surface features of Pluto in rich detail when it reached the dwarf planet in July 2015. Some of the features look like snapshots of rivers and lakes that are locked firmly in place by Pluto's frigid temperatures. But now scientists studying the data coming back from New Horizons think that those frozen lakes and rivers could once have been liquid nitrogen. Pluto has turned out be a surprisingly active place. New Horizons has shown us what might be clouds in Pl...