“The image was taken as New Horizons flew past Pluto on July 14, 2015, from a distance of 50,000 miles”
Just checked with website heavens-above.com and Pluto is just over 3 billion miles away at this time (Range: 32.5 AUs — An A.U. (Astronomical Unit), the average distance between the earth and sun, is roughly 92.5 million miles.
http://heavens-above.com/PlanetSummary.aspx?lat=0&lng=0&loc=Unspecified&alt=0&tz=UCT
That’s quite a photo. Not expected at all.