Doesn’t look peachy, but it’s crackingNASA/JHUAPL/SwRI.By Conor GearinPluto probably has a liquid ocean sandwiched between a rocky core and an icy shell. When NASA’s New Horizons spacecraft flew by the tiny world in July 2015, it captured the sharpest-ever images of the planet’s surface. That close-up helped Noah Hammond of Brown University in Rhode...