ALMA telescopes, Chajnantor Plateau

ALMA telescopes, Chajnantor Plateau

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Caption: ALMA telescopes, Chajnantor Plateau. Aerial view of the telescopes (foreground) of the Atacama Large Millimeter Array (ALMA) on the Chajnantor Plateau, at an altitude of 5000 metres in the Chilean Andes. The large radio telescope antennas have a diameter of 12 metres, while 12 smaller antennas with a diameter of 7 metres make up the ALMA Compact Array (ACA). Data from the separate antennas is combined by interferometry, making it one of the most powerful telescopes in the world. On the horizon, the main peaks from right to left are the lava dome Cerro Chajnantor and the volcanoes Cerro Toco, Juriques and the conical Licancabur volcano (5920 metres, just left of centre). This photo was taken in December 2012, four months prior to the ALMA inauguration.

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