Pluto Pluto

Pluto's shoreline of Sputnik Planum is seen in the highest-resolution images yet to come from New Horizons. John Spencer of the Southwest Research Institute says the details support the idea that the mountains "are huge ice blocks that have been jostled and tumbled and somehow transported to their present locations." NASA/JHUAPL/SwRI hide caption

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NASA/JHUAPL/SwRI

The new object is one of many dwarf planets orbiting at the edge of the solar system. This artist's conception shows the previous record-holder for distance, a dwarf planet called Eris. ESO/L. Calçada hide caption

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ESO/L. Calçada

Astronomers Spot Most Distant Object So Far In The Solar System

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This view of Pluto is based on high-resolution images taken on by NASA's New Horizons spacecraft and shows a diverse and complex surface variety. NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute hide caption

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NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute

Members of the New Horizons science team react to seeing the spacecraft's image of Pluto on Tuesday, before its closest approach. Bill Ingalls/NASA via AP hide caption

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Bill Ingalls/NASA via AP

Photos Of Pluto Reveal A 'Toy Store' Of Surprises

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On The Cold, Dead Fringes Of The Solar System, Pluto Looks Shockingly Lively

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Pluto Discoverer's Hometown Throws Big Bash For (Non-Dwarf!) Planet

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An image of Pluto that was taken by New Horizons shortly before its flyby Tuesday shows a heart-shaped pattern on the planet's surface. NASA says Pluto "sent a love note back to Earth." NASA/Johns Hopkins Applied Physics Laboratory/Southwest Research Institute hide caption

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NASA/Johns Hopkins Applied Physics Laboratory/Southwest Research Institute

NASA Zooms In On Pluto, For Closest Views Yet

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Earth Gets A Close-Up View Of Its Most Distant Neighbors

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A portrait of Pluto (right) and its moon Charon in a colorized, composite image made July 11 during the final approach of the New Horizons spacecraft. Astronomers are eager to get a much closer view of the icy world Tuesday. NASA-JHUAPL-SWRI hide caption

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NASA-JHUAPL-SWRI

Planet Or Not, Icy Pluto To Finally Get Its Day In The Sun

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NASA's New Horizons mission will be the first ever to visit Pluto and its moons. This artist's conception shows the probe as it passes the dwarf planet. JHUAPL/SwRI hide caption

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JHUAPL/SwRI

Pluto-Bound Spacecraft Nears Its Quarry

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NASA/ESA/M. Buie (Southwest Research Institute)

Oh, Snap! NASA Promises Best Photo Yet Of Faraway Pluto

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An artist's concept shows the New Horizons spacecraft as it approaches Pluto and its largest moon, Charon, in July 2015. Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute hide caption

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Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute

Mark Your Calendars: In A Year, We'll Arrive At Pluto

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Artist concept of New Horizons spacecraft. The Hubble Space Telescope is being pressed into service to help scientists look for a post-Pluto target for the space probe. Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute hide caption

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Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute