KEES VEENENBOS / SCIENCE PHOTO LIBRARY KEES VEENENBOS / SCIENCE PHOTO LIBRARY
Water on Mars. Computer artwork looking east over the sea filling the Isidis Planitia (Isidis Plain) at sunrise on Mars 3.5 billion years ago. This region lies near the Martian equator. Mars is now a desert world, but erosion features seen on Mars today suggest that water once flowed there. The water was lost due to the thin Martian atmosphere and weak gravity. The topography of this artwork was drawn with Terragen software, using data from the laser altimeter on the Mars Global Surveyor probe.
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