A Super Grand Canyon on Pluto's Moon Charon

Explanation: Pluto's largest moon, Charon, is home to an unusual canyon system that's far longer and deeper than the Grand Canyon. The inset above magnifies a portion of the eastern limb in the global view of Charon at left, imaged by NASA's New Horizons spacecraft several hours before its closest approach on July 14, 2015. A deep canyon informally named Argo Chasma is seen grazing the limb. The section of it seen here measures approximately 185 miles (300 kilometers) long. As far as New Horizons scientists can tell, Argo's total length is approximately 430 miles (700 kilometers) long — for comparison, Arizona's Grand Canyon is 280 miles (450 kilometers) long.

Pluto

Image credit: NASA/JHUAPL/SwRI