This purple star map is our best guess at the shape of the universe at half its current age, according to a new simulation from a research team at Argonne National Lab. The project is called the Hardware/Hybrid Accelerated Cosmology Code (HACC), an attempt to use supercomputers to model the intricate physics of mass in an expanding universe. The hope is that by understanding the patterns of matter in the universe, cosmologists can track down the dark matter that experts estimate composes roughly 25 percent of our universe. Running on Titan, the simulation used over 25 petaflops of peak processing power, a speed that only one other computer in the world could manage.
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