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If you were to build your own satellite (say, like a CubeSat), is it required to build it in sterile conditions? The satellite would never reach another planet/the Moon so I wouldn't have thought that contamination is an issue.

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No, sterile conditions aren't necessary for most spacecraft. Satellites are usually built in a cleanroom to prevent dust and dirt getting in and causing problems like electrical shorts, dirt in moving parts causing extra wear, and contamination of optical systems.

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