It took three sky surveys—conducted at telescopes in two continents, covering one-third of the visible sky, and requiring almost 1,000 observing nights—to prepare for a new project that will create the largest 3-D map of the universe’s galaxies and glean new insights about the universe’s accelerating expansion.
Click here for original story, 3 sky surveys completed in preparation for Dark Energy Spectroscopic Instrument
Source: Phys.org