PetitSat's instruments, INMS and GRIDS (IMAGE) NASA/Goddard Space Flight Center Caption PetitSat is flying a version of the Goddard-developed Ion-Neutral Mass Spectrometer (left) and the university-provided Gridded Retarding Ion Drift Sensor. Credit Credits: 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.