One of the 66 ALMA antennas against the backdrop of a rare cloudy sky

This image from the European Southern Observatory (ESO) Photo Ambassador Sergio Otarola Lanio shows one of the 66 ALMA antennas against the backdrop of a rare cloudy sky above the Chajnantor plateau in the Chilean Andes. © Sergio Otárola - ALMA (ESO/NAOJ/NRAO)