How To Avoid Contaminating Planetary Neighbors When the rovers Spirit and Opportunity hit Martian soil, scientists say they probably arrived with guests: thousands of bacteria. Planetary scientist Christopher McKay argues that future missions shouldn't dirty the planet in ways that subsequent generations can't clean up.
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How To Avoid Contaminating Planetary Neighbors

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How To Avoid Contaminating Planetary Neighbors

How To Avoid Contaminating Planetary Neighbors

How To Avoid Contaminating Planetary Neighbors

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When the rovers Spirit and Opportunity hit Martian soil, scientists say they probably arrived with guests: thousands of bacteria. Planetary scientist Christopher McKay argues that future missions shouldn't dirty the planet in ways that subsequent generations can't clean up.