The Atacama Pathfinder Experiment (APEX) (IMAGE) Australian National University Caption The Atacama Pathfinder Experiment (APEX), on the 5000-metre altitude plateau of Chajnantor in the Chilean Andes. Credit ESO/B. Tafreshi/TWAN (twanight.org) Usage Restrictions The full image or footage credit must be presented in a clear and readable manner to all users, with the wording unaltered. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.