,As I finished my Ph.D. in 1992, the universe was full of mystery—we didn’t even know exactly what it is made of. One could argue that cosmologists had made little progress in our understanding of these basic facts since the discovery of the cosmic microwave background (CMB), the afterglow of the Big Bang, in the 1960s. ,As I finished my Ph.D. in 1992, the universe was full of mystery—we didn’t even know exactly what it is made of. One could argue that cosmologists had made little progress in our understanding of these basic facts since the discovery of the cosmic microwave background (CMB), the afterglow of the Big Bang, in the 1960s. Astronomy Phys.org – latest science and technology news stories