This stunning image of Mars shows how massive floods once carved an intricate system of channels into the surface of the red planet. This picture, stitched together from 67 images taken with the high-resolution stereo camera aboard the ESA’s Mars Express, shows the planet's Kasei Valles.
One of the largest outflows on Mars, Kasei Valles extends some 3000km and descends by 3km in altitude. The scene show in the image covers an area of 987km north to south, and 1550km east to west. [ESA]