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Images taken between April 12 and April 18 by New Horizons of Pluto not only show one complete rotation of the planet as well as its moon Charon, the images also show a bright spot at Pluto’s pole that could be a polar cap.
The article calls it an “ice cap” but that is premature. At Pluto that cap could be made of a number of materials, not just water. We will not know until New Horizons gets closer.