Figure 22.10 Photographs of Pluto. Left: The heart-shaped region called Tombaugh Regio is outlined. This region is named after Pluto's discoverer Clyde Tombaugh [KP, NASA/APL/SwRI , http://1.usa.gov/1MOuT3m]. Right: False-colour images show compositional variations in Tombaugh Regio. [KP, NASA/APL/SwRI , http://1.usa.gov/1SO9bBu]