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Seems that there are a few in the new images. This is the border of the smooth white area and the darker spots. This reminds me a lot of Iapetus. You can clearly see impact craters at the edges of the "white" area. There is also a larger crater that looks very similar to a lunar maria with a flooded floor. So my initial guess that there is something on Pluto that is causing it to resurface itself may be at least partially correct. Neat.