Atacama Pathfinder Experiment

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What Wikipedia says

The Atacama Pathfinder Experiment (APEX) is a radio telescope 5,104 meters above sea level, at the Llano de Chajnantor Observatory in the Atacama Desert in northern Chile, 50 km east of San Pedro de Atacama built and operated by three European research institutes.

Excerpt from the Wikipedia article “Atacama Pathfinder Experiment”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: ESO/H.H.Heyer, CC BY 4.0, via Wikimedia Commons.