Roland Wester and Malcolm Simpson (IMAGE) University of Innsbruck Caption Physicists Roland Wester (left) and Malcolm Simpson (right) demonstrate how dipole-bound states allow negative ions to form in interstellar clouds. Credit Bryan Goff on Unsplash / AG Wester 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.