Spotlight On Pluto's Frozen Polar Canyons

Pluto's frozen nitrogen custard "heart" has certainly received its share of attention. Dozens of wide and close-up photos homing on this fascinating region rimmed by mountains and badlands have been relayed back to Earth by NASA's New Horizons probe after last July's flyby. For being only 1,473 miles (2,370 km) in diameter, Pluto displays an incredible diversity of landscapes. This week, the New Horizons team shifted its focus northward, re-releasing an enhanced color image of the north polar ar...