Thomas Karl (IMAGE) University of Innsbruck Caption Thomas Karl am Innsbrucker Atmosphärenobservatorium über Innsbruck. Credit Universität Innsbruck Usage Restrictions The picture may be used for editorial purposes only. It is protected by copyright. The use is free of charge if the reference is mentioned. License Original 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.