Dark Energy Spectroscopic Instrument (DESI) is perched atop a telescope at the Kitt Peak National Observatory in the U.S. state of Arizona. Each of the instrument's 5,000 fiber-optic robots can observe a galaxy for 20 minutes, allowing astronomers to chart what they have called the largest-ever 3D map of the universe. The results were announced at conferences in the United States and Switzerland on Thursday, ahead of a series of scientific papers being