Three ALMA Antennas Working in Unison (IMAGE) ESO Caption Three ALMA antennas linked together as an interferometer for the first time, on the 5,000 m altitude plateau of Chajnantor. Having three antennas observing in unison makes it possible to correct errors that arise when only two antennas are used, thus paving the way for precise images of the cool Universe at unprecedented resolution. Credit ALMA (ESO/NAOJ/NRAO) Usage Restrictions None 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.