An aerial image of the Cerro Tololo Interamerican Observatory in Chile, with the silvery dome of the 4-meter Blanco telescope pictured at lower right. (Photo: NOAO/AURA/NSF)
July 8, 2019
An aerial image of the Cerro Tololo Interamerican Observatory in Chile, with the silvery dome of the 4-meter Blanco telescope pictured at lower right. (Photo: NOAO/AURA/NSF)