A Chemical Trail from a Sounding Rocket (IMAGE) NASA/Goddard Space Flight Center Caption A chemical trail like the one here -- this one deployed from a sounding rocket at night as opposed to in the daytime -- will help researchers track wind movement to determine how it affects the movement of charged particles in the atmosphere. 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.