Alan Stern, principal investigator for the New Horizon mission, reveals his biggest surprise so far as the probe closes in on Pluto. (Recorded 12 July 2015.)
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‘X’ marks a curious corner on Pluto’s icy plains
“X” marks the spot of some intriguing surface activity in the latest picture of Pluto returned from NASA’s New Horizons spacecraft. This image from the Long Range Reconnaissance Imager (LORRI) extends New Horizons’ highest-resolution views of Pluto to the very centre of Sputnik Planum, the informally named icy plain that forms the left side of Pluto’s “heart” feature.
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View Pluto’s bladed terrain in 3-D
One of the strangest landforms spotted by NASA’s New Horizons spacecraft when it flew past Pluto was the “bladed” terrain formally named Tartarus Dorsa. The blades reach hundreds of feet high and are typically spaced a few miles apart. No geology degree is necessary to see why the terrain is so interesting — just grab your red and green 3-D spectacles.
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Pluto’s mysterious, floating hills
The nitrogen ice glaciers on Pluto appear to carry an intriguing cargo: numerous, isolated hills that may be fragments of water ice from Pluto’s surrounding uplands. Since 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.