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discovery-of-helium-traces-atmospheric-escape-in-hot-exoplanets The Solar System gas giants Jupiter and Saturn orbit our Sun at large distances, where solar light carries only little heat. The situation is quite different in extrasolar planetary systems like HD 189733 and WASP-69. Here two gas giants orbit their stars at such small distances that a complete revolution, corresponding to one "year" on the planet, takes only a few days. In such proximity, stellar irradiation strongly heats the gas giants, which are therefore called hot Jupiters. One of the exciting questions in exoplanet research is how the atmospheres of hot Jupiters react in their extreme environments and if the planets even constantly endure evaporation. Planetary transits are invaluable opportunities to observe such phenomena. When a...