NASA / JPL-Caltech / Johns Hopkins University Applied Physics Lab / Southwest Research Institute / Emily Lakdawalla
All Their Sunrises And Sunsets
Titan as seen by Cassini on 22 June 2010, and Pluto as seen by New Horizons on 14 July 2015. Both worlds are viewed from a phase angle of 165 degrees -- nearly from behind. Both have atmospheres; particles in the atmospheres scatter sunlight forward toward New Horizons, lighting them up. The observing spacecraft are seeing the skies in all the locations where the Sun is rising or setting on the surface. The Pluto image has been downsized to match the scale of the Titan image.