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Without at all endorsing the paper I can say that the SEM images are of diatoms. In fact the ones in the left hand image are very similar to the type I found in great abundance in lake sediments on Fraser Island (Aulacosiera sp.).
Ignoring for the moment the many apparent problems with the paper (eg the red rain story), the authors claim to have unequivocal evidence of extra-terrestrial life but can only publish it in an obscure on-line journal, a journal of which the lead author is an editor. Why isn't this in Nature or Science or at least the Journal of Astrobiology?
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