. "7 Planetary Protection for Mars Missions." An Astrobiology Strategy for the Exploration of Mars. Washington, DC: The National Academies Press, 2007.
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An Astrobiology Strategy for the Exploration of Mars
FIGURE 8.1 The gullies at the edge of this crater may have been formed recently by groundwater flowing to the surface from specific horizons. Image from the Mars Orbiter Camera on the Mars Global Surveyor spacecraft courtesy of NASA/JPL/Malin Space Science Systems.
