What did scientists learn about Pluto when the New Horizons spacecraft visited the Pluto system in 2015?

New Horizons Fly-by

On July 14, 2015, the New Horizons spacecraft flew by Pluto giving us mesmerizing new images of the Dwarf planet and its moons. Scientists started analyzing add the data and these are the findings: ... Its estimated that Pluto is 70% rock and 30% and could well have an internal water-ice ocean.

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