Mayall Interior (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption A view inside the dome at the Mayall Telescope near Tucson, Arizona. The 2-meter corrector barrel atop the telescope will be removed and replaced with a new corrector barrel for the Dark Energy Spectroscopic Instrument. DESI's installation will begin soon. Credit Credit: P. Marenfeld and NOAO/AURA/NSF Usage Restrictions Editorial Use Only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.