Observatorio del Roque de los Muchachos (IMAGE) Johannes Gutenberg Universitaet Mainz Caption Das Observatorium Roque de los Muchachos, auf der Kanareninsel La Palma in 2400 Meter Höhe am Hang eines erloschenen Vulkans gelegen, bietet günstige Bedingungen, um die beschriebenen Experimente durchzuführen. Credit Foto/©: Felipe Pedreros Bustos Usage Restrictions This image may only be used in connection with the press release "Earth's magnetic field measured using artificial stars at 90 kilometers altitude", issued by Johannes Gutenberg University Mainz on November 14, 2018. 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.