Firefly Satellite (IMAGE) NASA/Goddard Space Flight Center Caption This is an artist's rendition of the football-sized Firefly satellite in low-Earth orbit. Firefly's mission is to study the relationship between lightning and huge bursts of gamma rays called terrestrial gamma ray flashes. Credit Image Credit: NASA/Goddard Space Flight Center 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.