Aurora (IMAGE) NASA/Goddard Space Flight Center Caption In additional to the five THEMIS spacecraft launched into space, 20 THEMIS ground stations can observe aurora from the ground. Credit NASA/Goddard Space Flight Center Scientific Visualization Studio 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.