At the beginning space was the real of gods and each constellation was a place of magic or mythologica tale.From Icarus, Kepler, Goodwin to Jules Verne, space was present in the minds and excited imaginations. Astronomy and its illustrious representatives, Thales, Pythagorus, Hipparchus, Ptolemy, Copernicuas, Galileo... contribute to the knowledge of space and its laws.During the preparation of Destination Moon and Explorers on the Moon, Hergé had pretty much read everything avalable about space and astronautics.