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Prevent contamination. Contamination is something that NASA and other space agencies are careful about when sending rovers to other planets (e.g. Mars). Rovers could accidentally release bacteria ...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:46Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/21559 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/