https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/3322640Edit ImageSaveSaveEditCropCustom TextA photograph taken in the 20-inch liquid hydrogen bubble chamber, showing about fifteen high energy pi-mesons entering in a parallel beam from the left. Original public domain image from FlickrMorePublic DomainFree CCO U.S. Government image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 698 px | 300 dpiLarge JPEG 3200 x 1861 px | 300 dpiFree DownloadA photograph taken in the 20-inch liquid hydrogen bubble chamber, showing about fifteen high energy pi-mesons entering in a parallel beam from the left. Original public domain image from FlickrMore