Neptune on Tritonís horizon

Neptune on Tritonís horizon

. From its satellite Triton (foreground), the planet Neptune would appear to move laterally along the horizon. Terraces on the moonís surface indicate multiple exposures of icy volcanic flooding, while a huge anti-cyclonic storm system, the Great Dark Spot, is visible in Neptuneís atmosphere. (Courtesy of NASA and JPL.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University