Highs and lows of Marsí topography

Highs and lows of Marsí topography

Fig. 2.43 . Global topographic maps of two sides of the planet Mars, based on detailed laser altimeter measurements from the Mars Global Surveyor spacecraft. In these images, color represents height above (or below) the mean planetary radius, ranging from dark blue (-8 kilometers) through green, yellow and red (+4 kilometers) to white (over 8 kilometers in altitude). Flowing water would run downhill, collecting in the low lying blue regions including the Hellas impact basin (upper image), about 2.8 thousand kilometers across, the Valles Marineris (lower image), shown as a horizontal gash beside the Tharsis volcanoes (pink), and the extensive lowland plains in the north (top of both images). (Courtesy of NASA/JPL/ GSFC.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University