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hubie [soylentnews.org] writes:

Pluto images from the New Horizons’ [nasa.gov] Multispectral Visible Imaging Camera (MVIC) instrument show large hills of water ice, up to several kilometers across, floating on a sea of nitrogen ice [nasa.gov].

Because water ice is less dense than nitrogen-dominated ice, scientists believe these water ice hills are floating in a sea of frozen nitrogen and move over time like icebergs in Earth’s Arctic Ocean. The hills are likely fragments of the rugged uplands that have broken away and are being carried by the nitrogen glaciers into Sputnik Planum.

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