A New Horizons picture released July 3 shows smooth surface details on Pluto, and a dark polar region on Charon, the dwarf planet’s biggest moon.

Image: Pluto and Charon

By Alan Boyle

Mastermind of Cosmic Log, contributor to GeekWire and Universe Today, author of "The Case for Pluto: How a Little Planet Made a Big Difference," past president of the Council for the Advancement of Science Writing.

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