This is the title of a new fantastic book that is quite timely: From the Realm of the Nebulae to the Society of Galaxies Dialogues on a Century of Research D’Onofrio, M.; Rampazzo, R. & Zaggia, S. (Eds.) Astrophysics and Space Science Library, Vol 45 Springer International Publishing, 2016. http://www.springer.com/fr/book/9783319310046 In order to outline possible […]