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Icebergs Float on Pluto’s Nitrogen Ocean

NASA researchers say they have have spotted iceberg-like “hills” floating on a sea of frozen nitrogen on Pluto. The hills, which are seen in the “Sputnik Planum” plane inside the so-called “heart,” are from one to several kilometers across, according to photos beamed back to Earth from the New Horizons probe. NASA believes the hills are made of water ice because water is less dense than nitrogen. The hills, NASA says, move much like Earth’s icebergs and are “likely fragments of...

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