<p>For NASA’s James Webb Space Telescope and its incredibly sensitive scientific instruments, cleanliness is critical. Contamination Control Engineers like Yingrui “Zao” Huang, who has been on the mission since 2013, play an important role in ensuring Webb’s hardware is in pristine condition during the testing and integration that lead up to launch.
</p><p>Zao is pictured in the Spacecraft Systems Development and Integration Facility (SSDIF)  at NASA Goddard, standing in front of the wall of filters that help keep the cleanroom clean.
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Image credit: NASA/Chris Gunn
<bdi><a href="https://www.wikidata.org/wiki/Q110278636" class="extiw" title="d:Q110278636"><span title="American photographer">Chris Gunn</span></a>
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/nasawebbtelescope/48061652421/">Contamination Control Engineer Yingrui "Zao" Huang</a>