Pluto's Dark Side Spills Its Secrets

Pluto's Dark Side Spills Its Secrets
NASA/JHUAPL/SwRI via AP

When NASA's New Horizons spacecraft zipped past Pluto in 2015, it showed a world that was much more dynamic than anyone had imagined. The dwarf planet hosts icy nitrogen cliffs that resemble the rugged coast of Norway, and giant shards of methane ice that soar to the height of skyscrapers.

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