Today Cray announced that it has delivered and installed a Cray XC50 supercomputer at the National Astronomical Observatory of Japan (NAOJ). The supercomputer, nicknamed NS-05 “ATERUI II,” provides more than 3 peak petaflops making it the world’s most powerful supercomputer dedicated to astrophysical calculations. “NAOJ will use the system as a new “telescope” for theoretical astronomy to perform full-scale, high-resolution simulations of the formation and evolution of the Milky Way galaxy as well as three-dimensional simulations of a supernova explosion with realistic microphysics, among other models.”