NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Martian topography. Mars. Elevation is colour-coded, from white (highest) through red, yellow, green and blue to purple (lowest). The Martian equator runs across centre. The 2,300 kilometre wide Hellas Planitia impact basin (dark blue) is at lower left. At upper right is Elysium Mons (red), a large volcano. Just above centre middle is the Isidis Planitia impact basin, which measures 1,500 kilometres wide. Upper right (pale to dark blue) is the huge northern basin, a region of low, smooth terrain that may have formed from a massive impact in the past. Data collected by the Mars Orbiter Laser Altimeter (MOLA) on the Mars Global Surveyor spacecraft.
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