It took three sky surveys — with telescopes on two continents covering one-third of the visible sky over a span of 1,000 nights — to prepare for a new project that will create the largest 3D map of the universe’s galaxies and glean new insights about the universe’s accelerating expansion. https://newscenter.lbl.gov/2019/07/08/3-sky-surveys-completed-in-preparation-for-dark-energy-spectroscopic-instrument/
January 2019 – July 2022
