Encke Tail (IMAGE) Southwest Research Institute Caption Individual clumps of tail material bob and twist in the turbulent solar wind, in this highly processed image of Comet Encke from the HI-1 instrument on board NASA's STEREO-A spacecraft. The circular dots mark individual clumps that where tracked by the SwRI/University of Delaware team to measure the flow of the solar wind. Credit Image Courtesy of NASA/SwRI Usage Restrictions ©2015 Southwest Research Institute® These images/videos may be used by the media and the public for educational and informational purposes only. 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.