Lighting the Sky (image) The Earth Institute at Columbia University Share Print E-Mail Caption This is an artistic impression of how auroras could be more widespread under a geomagnetic field much weaker than today's. Credit Huapei Wang, with source files courtesy of NASA's Earth Observatory/NOAA/DOD Usage Restrictions Credit must be given. Share Print E-Mail 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.