The certificate recognizes that Sayan Datta successfully completed and received a passing grade in ANU-ASTRO1x: Greatest Unsolved Mysteries of the Universe, an online course offered by ANUx, an initiative of the Australian National University through edX. The course was focused on some of the greatest unsolved mysteries of the universe. The certificate is signed by the Deputy Vice-Chancellor, ANU Online Lead, and two Professors from the Australian National University to verify its authenticity.