Pluto's Underworld and Icy Heart Collide in New View

The new, highly detailed image of the boundary area shows the icy plains that belong to the larger, heart-shaped region known informally as Sputnik Planum and the much darker highlands informally known as Krun Macula. The new image comes from NASA's New Horizons spacecraft, which made a close flyby of Pluto in July 2015.