The International Space Science Institute offers Johannes Geiss visiting fellowship for international young scientists. Fellowship is awarded to contribute to the achievement of a deeper understanding of the results of space research missions, adding value through multi-disciplinary research in an atmosphere of international cooperation. JGF would offer a stipend, paying travel expenses and living expenses for a stay at ISSI of 1-6 months, possibly in several separate intervals, to coincide with time availability on university academic calendars.