https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/3322782Edit ImageSaveSaveEditCropCustom TextPhoto shows a side view of the Astron device. A single-layer solenoid, 92 feet long, is built around an aluminum vacuum vessel. Circa 1966. Original public domain image from FlickrMorePublic DomainFree CCO U.S. Government image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 957 px | 300 dpiLarge JPEG 3200 x 2551 px | 300 dpiFree DownloadPhoto shows a side view of the Astron device. A single-layer solenoid, 92 feet long, is built around an aluminum vacuum vessel. Circa 1966. Original public domain image from FlickrMore