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Microfossils discovered in the Murchison meteorite which resemble cyanobacteria. If they are contaminants or from another planet is unknown. Reprinted from Joseph & Schild, 2010a.

Microfossils discovered in the Murchison meteorite which resemble cyanobacteria. If they are contaminants or from another planet is unknown. Reprinted from Joseph & Schild, 2010a.

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In the space of the entire universe, the only conclusive evidence of life, is found on Earth. Although the ultimate source of all life is unknown, many investigators believe Earth, Mars, and Venus may have been seeded with life when these planets, and the sun, were forming in a galactic cluster of thousands of stars and protoplanets. Yet others hyp...