DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Mars topographical map. Three-dimensional composite satellite image of the surface of Mars. Topographical features are labelled in white. North is at top. In this false-colour image, elevation is colour coded from white (highest) through red, yellow, green and blue to purple (lowest). Features visible include the Hellas Planitia (lower centre, purple), a large impact basin, which at about 2,300 kilometres in diameter is the largest impact structure on the planet. The map was created using data from the Mars Global Surveyor spacecraft's Mars Orbiter Laser Altimeter.
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