Screw of Light (2 of 2) (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.