![Black and white photo of two men looking at small engine](https://www.nasa.gov/wp-content/uploads/2023/03/151186main_image_feature_600_ys_full.jpg)
Ion Engine Inspection
An engineer and a technician check out an ion engine in the Electronic Propulsion Research Building at the Lewis Research Center (now NASA's Glenn Research Center) in 1961. Ion engines use electrostatic charge.
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https://www.nasa.gov/image-detail/ion-engine-inspection/
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