86 (IMAGE) University of Vienna Caption Image of the screw of light on the wall of the Optical Ground Station telescope of the ESA in Tenerife, Canary Island, - after being transmitted over more than 100 km. The ring-like structure, a signature of screws of light, is still clearly visible. Credit Copyright: University Vienna Usage Restrictions The image may only be used with appropriate caption or credit. 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.