https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/441483Edit ImageSaveSaveEditCropCustom TextInterior of the 20-foot diameter vacuum tank at the NASA Lewis Research Center’s Electric Propulsion Laboratory. Original from NASA . Digitally enhanced by rawpixel.MorePublic DomainFree CCO U.S. Government image for Personal and Business useInfoView CC0 LicenseJPEGTIFFSmall JPEG 1200 x 900 px | 300 dpiLarge JPEG 2048 x 1536 px | 300 dpiTIFF 2048 x 1536 px | 300 dpi | 18.03 MBFree DownloadInterior of the 20-foot diameter vacuum tank at the NASA Lewis Research Center’s Electric Propulsion Laboratory. Original from NASA . Digitally enhanced by rawpixel.More