February 20, 2004
This vertical view shows the mouth of Kasei Vallis, one of the largest outflow channels on Mars, taken by Mars Express. The part of the outflow channel seen in this image has most probably been carved by glaciers or gigantic water-related outflows known from terrestrial subglacial lakes. The blackish-blue colour is related to sediments. The bright streaks oriented NE-SW are related to wind forces. This image shows various details which give an insight into the erosional history of the outflow channel. The image also illustrates how difficult it is to achieve near-true colour in images of Mars when atmospheric dust and haze have a major disturbing influence on the scene.