On 21 June, 14:17 Central European Summer Time, when a Proton M rocket launches in the Russian space port of Baikonur to bring the eROSITA X-ray telescope into space on board the SRG satellite, a piece of FAU know-how will also be on board. Astronomers from the Dr. Karl Remeis Observatory at the Friedrich Alexander University Erlangen-Nürnberg (FAU) helped develop the telescope with special software for mathematical models. But also during the seven-year mission, the team around Prof. Dr. Jörn Wilms, Professor of Astronomy and Astrophysics, will take over an important part of the analysis of the measurement data collected by eROSITA.