Image: Martian north polar cap

Description: The Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) acquired this image of the Martian north polar cap in early northern summer. The picture was acquired on March 13, 1999, near the start of the Mapping Phase of the MGS mission. The light-toned surfaces are residual water ice that remains through the summer season. The nearly circular band of dark material surrounding the cap consists mainly of sand dunes formed and shaped by wind. The north polar cap is roughly 1100 kilometers (680 miles) across.
Title: Martian north polar cap
Credit: http://www.msss.com/mars_images/moc/may_2000/n_pole/ file http://photojournal.jpl.nasa.gov/catalog/PIA02800
Author: NASA/JPL/Malin Space Science Systems
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License: Public domain
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