‘Super grand canyon’ discovered on Charon
The canyon informally named Argo Chasma 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.
NASA released a close-up image of the canyon New Horizons took during its closest approach to Charon on July 14, 2015.
The spacecraft is still sending data back to Earth, giving scientists plenty of new material to work through even as it continues on to the next phase of its mission.