- Uchuu Project Overview: Uchuu is a simulation of the formation of the Large Scale Structure of the Universe based on the mutual gravitational interactions between the dark matter particles, and it can resolve smaller features to depict the Universe in greater detail. Uchuu has 2,097,152,000,000 (two trillion) particles! It was run with GreeM3 N-body code by Tomoaki Ishiyama at the ATERUI II supercomputer in Japan. The Uchuu simulation has delivered 4PB of raw data! All Uchuu data products are made publicly available via Skies & Universes in Spain. "Uchuu" is a Japanese word meaning "Universe".