Material beneath Sputnik Planitia (an area within Tombaugh Regio - Pluto's 'heart') may be pushing the surface outwards, causing a "positive gravitational anomaly," according to NASA New Horizons co-investigator Richard Binzel. This has led to a theory that slushy water-ice may be the cause of the push, and in turn, assist in the orbital alignment of Pluto and it's moon Charon. -- Full Story:
Credit: Space.com / imagery: NASA/SwRI/JHUAPL/Stuart Robbins / edited by @SteveSpaleta