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THE SHEER COMPLEXITY OF PLUTO The diversity of phenomena seen on Pluto was far beyond what anyone, even New Horizons team members, expected to find on such a small planet so cold and far from the Sun. Ground fogs, high-altitude hazes, possible clouds, canyons, towering mountains, faults, polar caps, apparent dune fields, suspected ice volcanoes, glaciers, evidence for flowing (and even standing) liquids in the past, and more. This little red planet perched 3 billion miles away in the Kuiper Belt packed more punch than any other known small world explored, and indeed more punch than many much larger worlds. The variety of terrains, its complex interactions between the surface and the atmosphere, and the wide range of surface ages even prompted the New Horizons team to adopt the slogan “Pluto is the new Mars.
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