SPHERES (IMAGE) NASA/Johnson Space Center Caption Three satellites fly in formation as part of the Synchronized Position Hold, Engage, Reorient, Experimental Satellites investigation on the International Space Station. Credit NASA Usage Restrictions None 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.