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English: This is a scanning electron microscope (SEM) image of a series of partly filled pits on the surface of a mineral grain from Nakhla. Similar pits are sometimes found on Earth minerals which have been exposed to microbial attack. They are interpreted as etch features caused by organic acid generated by microbes and their biofilms. The pits in the Martian minerals are partly filled with debris, possibly the clay-like remains of organic microbes.
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Source http://www.nasa.gov/centers/johnson/home/mars_meteorite.html
Author NASA/David McKay

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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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November 2009

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439a8a76c3a455914f4a2d172d9a5f32ec9f2ecc

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current11:22, 2 December 2009Thumbnail for version as of 11:22, 2 December 20091,280 × 1,024 (286 KB)KGyST{{Information |Description={{en|1=This is a scanning electron microscope (SEM) image of a series of partly filled pits on the surface of a mineral grain from Nakhla. Similar pits are sometimes found on Earth minerals which have been exposed to microbial a

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