New Horizons is approaching Pluto at a speed of more than 1 million kilometers per day. The spacecraft will still need about 9 days to cover more than 13M kilometers before the historical flyby. The images published today from JPL are more than 1M kilometer closer to the target than the previously released ones. As usual we have enlarged, stacked and sharpened the latest 3 images, trying to have a clearer view of the details.
The large dark area, already evident in previous images, is visible again here and its shape seems pretty similar to a large impact crater, or even a system of craters. Images (at least the ones released to the public, that are JPEG and have lower quality than the original ones) are not detailed enough yet to validate this hypotheses though, but in 2-3 days the resolution will improve dramatically.