Schematic of the GEO-X satellite. (IMAGE) Tokyo Metropolitan University Caption The GEO-X mission aims to observe the Earth’s magnetosphere using cosmic X-rays. It will only weigh 50kg. Credit Tokyo Metropolitan University Usage Restrictions Can be used with credit. License Original 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.