Mars sailplane descent (IMAGE) University of Arizona College of Engineering Caption The team conducted a tethered launch of an early version of the sailplane, in which it descended slowly to Earth attached to a balloon. Credit University of Arizona College of Engineering Usage Restrictions None 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.