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Alien hunter: NASA photo shows ventilation roof of underground ... - SFGate
URL: http://www.sfgate.com/science/article/Alien-hunter-NASA-photo-shows-ventilation-roof-11081507.php
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Submitted: Wed Apr 19 2017
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Scientists say honeycomb formations surrounding a strange-looking Martian crater recently photographed by NASA's Mars Reconnaissance Orbiter are eroded ...