A heart-shaped feature was viewed on Pluto's surface in the most detailed photo yet returned by NASA's New Horizons probe, which has now began its final run of its historic fly-by of the planet in the early morning hours on Wednesday. Mission scientists received the clearest image of the Reddish-Brownish-Dwar planet by the long-range reconnaissance a major lower-rate board the New Horizons, Shinhua reported, citing a NASA statement. The image, which New Horizons took on Tuesday when it was less than 5 million miles 8 million kilometers from Pluto, shows a large heart-shaped feature on the Dwar Planets surface that measures about 1,200 miles 2,000 kilometers wide.