Chart of ENA Flux Change (IMAGE) NASA/Goddard Space Flight Center Caption After an initial spike, energetic neutral atoms should rain back down on IBEX, forming a ring that expands across the sky over time. Credit Eric Zirnstein 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.