The reader can see a star that appears or disappears behind a planet. Such moments are particularly useful because thanks to the light rays that cross the atmosphere of a given planet, researchers from the Belgian Institute for Space Aeronomy will be able to deduce a whole range of information such as a planet’s composition, for instance. Furthermore, while the institute mainly studies changes in the composition of the atmosphere on earth, it also focuses on the atmosphere of other planets, such as Mars and Venus, or comets. In addition, the institute also specialises in space physics, with the solar wind and the magnetosphere among its favourite themes...