Flying above the ALMA AOS

Aerial view of the ALMA Array Operations Site (AOS), located at 5000 meters altitude on the Chajnantor plateau, in the Chilean Andes. At the top-right, seven 12-meter antennas are being tested on the closely-spaced pads of the Atacama Compact Array (ACA). © ALMA (ESO/NAOJ/NRAO), W. Garnier (ALMA). Acknowledgment: General Dynamics C4 Systems