Image:Mars Ice Age PIA04933 modest.jpg

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Credit: NASA/JPL/Brown University [1]

An illustration of what Mars might have looked like during an ice age between 2.1 million and 400,000 years ago, when Mars's axial tilt is believed to have been much larger than today. This illustration was prepared for the cover of the December 18, 2003 issue of the journal Nature.

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• http://photojournal.jpl.nasa.gov/catalog/?IDNumber=PIA04933
• http://photojournal.jpl.nasa.gov/jpegMod/PIA04933_modest.jpg

This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA copyright policy page or JPL Image Use Policy) Warnings: Use of NASA logos, insignia and emblems are restricted per US law 14 CFR 1221. The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not in the public domain. Materials from the Hubble Space Telescope may be copyrighted if they do not explicitly come from the STScI. [2] All materials created by the SOHO probe are copyrighted and require permission for commercial non-educational use. [3] Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [4]

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