New Horizons Unmasks the Mysteries of Pluto

Pluto's been a blank space in ourportrait of the solar system,so obscured that astronomersdid not even know its exactsize or color. But no longer.

By Corey S Powell
Nov 30, 2015 6:00 AMNov 14, 2019 9:16 PM
pluto_closeup.jpg
Round and strangely textured mountains rise near Pluto's day-night border in this 330-mile-wide view. | NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute

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On July 14, NASA’s New Horizons probe flew just 7,750 miles past Pluto’s surface and began radioing back detailed pictures. The sudden unveiling has revealed a complex and inexplicably varied landscape. “It’s a total surprise,” said mission leader Alan Stern as he pondered the images. “If an artist had painted this Pluto before our flyby, I probably would’ve called it over the top.”

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