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Figure 1 from The BlueTides Simulation paper; reproduced with permission; 
z = 8 refers to a redshift of 8 when the universe was a little over 1/2 billion years old.

BlueTides on Blue Waters: The First Galaxies

“The largest high-redshift cosmological simulation of galaxy formation ever has been recently completed by a group of astrophysicists (Drs. Feng, Di-Matteo, Croft, Bird, and Battaglia) from the U.S. and the U.K. This tour-de-force simulation was performed on the Blue Waters Cray XE/XK system at NCSA and employed 648,000 cores. They utilized approximately 700 billion particles (!) to represent dark matter and ordinary matter and to create virtual galaxies inside the supercomputer. The authors, who represent Carnegie Mellon University, UC Berkeley, Princeton University, and the University of Sussex, have given their simulation the moniker BlueTides.”