Eris is a computer simulation of the Milky Way galaxy's physics.[1] It was done by astrophysicists from the Institute for Theoretical Physics at the University of Zurich, Switzerland and University of California, Santa Cruz.[2] The simulation project was undertaken at the NASA Advanced Supercomputer Division's Pleiades and the Swiss National Supercomputing Centre for nearly eight months, which would have otherwise taken 570 years in a personal computer.[3] The Eris simulation is the first successful detailed simulation[3] of a Milky Way like galaxy.[1] The results of the simulation were announced in August 2011.