Images taken by the Long-Range Reconnaissance Imager (LORRI) instrument on board NASA’s New Horizons spacecraft suggest that Charon once had an underground water ocean that has long since frozen and expanded, pushing out on the moon’s surface and causing it to stretch and fracture on a massive scale. A close-up of the canyons on Charon, taken by New Horizons’ LORRI instrument during the spacecraft’s close approach to the Pluto system on July...
