powerful new astronomical instrument got its first view of the sky from an Arizona mountaintop two weeks ago. Once the device officially gets to work in early 2020, it will capture the light from thousands of galaxies each night — up to 5,000 galaxies every 20 minutes, in ideal conditions. With this instrument, researchers will make a deep-space map of where galaxies lie to study dark energy throughout the history of the universe.
Scientists installed the device, called the Dark Energy Spectroscopic Instrument (DESI), on a telescope at Kitt Peak National Observatory over a period of 18 months. And on October 22, DESI turned its gaze to the night sky to make its first test observations. Over the next few months, the DESI team will finish testing and begin its survey in earnest.
