This computer animation, created using new software called Arepo, simulates 9 billion years of cosmic history. Arepo can accurately follow the birth and evolution of thousands of galaxies over billions of years. Arepo generates the full variety of galaxies seen locally, including majestic spirals like the Milky Way and Andromeda.
Credit: CfA/UCSD/HITS/M. Vogelsberger (CfA) & V. Springel (HITS)