The pair of galaxies NGC 1531/2, engaged in a spirited waltz, is located about 70 million light-years away toward the southern constellation Eridanus (The River). R. Gendler and J.E. Ovaldsen/ESO/IDA hide caption

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Does The Size Of Space Freak You Out?

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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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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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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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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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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 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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