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FOREWORD by Dr Jim Garvin NASA
Fields of Giant Dunes
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altitude ancient asteroids astronaut astronomer atmospheric pressure average billion years ago bottom camera carbon dioxide Chryse Planitia climatic clouds color Columbia hills covered crater created Deimos deposited dry ice dunes dust storms Earth Elysium feet flood Following double foreground formed frost frozen carbon dioxide gullies Hellas basin horizon huge humid images impact inches lakes landing landscape layer liquid maghemite Mars Exploration Rovers Mars Global Surveyor Mars Pathfinder Mars's Martian atmosphere Michael Malin miles 3 km millibars minerals MOLA moon NASA northern hemisphere obliquity ocean Olympus Mons orbit oxygen Pathfinder percent Phobos plains planet surface planet's crust probes red planet robotic scientists sediment sedimentary shots solar system south polar cap south pole Space Spirit and Opportunity sublimation surface of Mars surrounding temperatures Tharsis Plateau thick topography Utopia Planitia Valles Marineris Vallis channel Viking landers Visions of Mars volcanic rocks volcanoes water ice winds yards