To commemorate a milestone anniversary for NASA’s Fermi spacecraft, the mission team has published an e-book called “Our High-Energy Universe: 15 Years with the Fermi Gamma-ray Space Telescope.” Readers can download the e-book in PDF and EPUB formats. The e-book is aimed at general audiences with an interest in space. Cover for the e-book “Our High-Energy Universe: 15 Years with the Fermi Gamma-ray Space Telescope.” NASA PDF(44.03 MB) [(https://science.nasa.gov/wp-content/uploads/2024/04/our-high-energy-universe.pdf?emrc=66283be270855) EPUB(804.49 MB) [(https://science.nasa.gov/wp-content/uplo…