Nasa experts believe the object may be a 'dirty block of water ice' which is floating in denser solid nitrogen. Also visible are thousands of pits in the surface, which scientists believe may form by sublimation.
Transmitted to Earth on Dec. 24, this image from the Long Range Reconnaissance Imager (LORRI) extends New Horizons' highest-resolution views of Pluto to the very center of Sputnik Planum, the informally named icy plain that forms the left side of Pluto's 'heart' feature (inset).
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