Welcome to Atacama Pathfinder EXperiment (APEX)

Welcome to the APEX web site. You will find here all about our project and the amazing 12-m radio telescope that we operate in northern Chile. APEX is located in a privileged location, on the “Llano de Chajnantor”, at 5100 m. above the sea level. At such high altitude, the dry atmosphere of the Atacama desert opens up a unique window to observe the millimetre and sub-millimetre light. The versatile set of state-of-the-art instrumentation onboard APEX is at the service of researchers around the world, to learn more about the cold and the dusty Universe.