Cherenkov Telescope Array-South in operation (artist’s impression)

CTA is a global initiative to build the world’s largest and most sensitive high energy gamma-ray observatory. Gamma rays are electromagnetic radiation of very high energy, emitted by the hottest and most extreme objects in the Universe — supermassive black holes, supernovae and maybe even remnants of the Big Bang. Read more about CTA on its dedicated web page. More information and download options: Credit: G. Perez, IAC