New Horizons Probe Makes Three Discoveries in Outer Solar System.

NASA's New Horizons probe, which flew by Pluto in 2015, has made three new discoveries in the outer solar system. The first is that Pluto's flip was caused by the formation of Sputnik Planitia, a 620-mile-wide basin that makes up half of the iconic heart-shaped region on Pluto. The second is that massive knife-like methane ice deposits extend to Pluto's far side. The third is that Arrokoth, a small object in the Kuiper Belt, is a gentle fusion of two objects that once orbited each other. New Horizons will also take color images of Uranus and Neptune as it studies distant Kuiper Belt objects.