Recording of the lecture given by Michel Blanc, astronomer, IRAP/Midi-Pyrénées Observatory, UPS-CNRS; Executive director, International Space Science Institute in Beijing, member of AAE, and Jean-Pierre Lebreton, former head of the Huygens mission at ESA, associate researcher, CNRS-Université d’Orléans-LPC2E, member of AAE, 26 June 2018, Media Library José Cabanis – Toulouse .