Impact and radiation models show only 1 ppm of microbes survive on Phobos and 100 ppm on Deimos, yielding contamination probabilities two orders of magnitude below COSPAR limits for 30 g, 10 cm samples.
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Assessment of the probability of microbial contamination for sample return from Martian moons II: The fate of microbes on Martian moons
Impact and radiation models show only 1 ppm of microbes survive on Phobos and 100 ppm on Deimos, yielding contamination probabilities two orders of magnitude below COSPAR limits for 30 g, 10 cm samples.