A Sounding Rocket Launches (IMAGE) NASA/Goddard Space Flight Center Caption A sounding rocket carrying an experiment to help calibrate the EVE instrument on NASA's Solar Dynamics Observatory launched on May 6, 2010. These calibrations occur approximately once a year and another occurs on Oct. 21, 2013. 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.