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The week in pictures: July 30–August 5, 2011

This week's news featured water on Mars, oxygen in space, a cratered asteroid, a spacecraft's launch, and more.
NASA/JPL-Caltech/Univ. of Arizona

NASA spacecraft data suggests water flowing on Mars

Dark, finger-like features appear and extend down some martian slopes during late spring through summer, fade in winter, and return during the next spring. Learn more »
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