Mars From Afar
Clouds
One early martian afternoon in April 1999, the Mars Orbiter Camera
(MOC) captured this view of diaphanous clouds floating over the
summit of Apollinaris Patera, a volcano near the planet's equator.
The various impact craters pockmarking its crater and flanks
indicate how ancient the volcano is. It is also enormous: An
estimated three miles high, its summit caldera alone is about 50
miles across. The color in this image was derived from the MOC's red
and blue wide-angle camera systems and does not represent true color
as you would see it with the naked eye.