New Horizons mosaic of Pluto's dark side reveals mountains and a cloud. A crescent Pluto glows magnificently in a mosaic by New Horizons; twilit by the Sun you can see mountains and maybe, just maybe, a cloud. Source: www.slate.com/blogs/bad_astronomy/2016/06/03/new_horizons_mosaic_of_pluto_s_dark_side_reveals_mountains_and_a_cloud.html