Les satellites artificiels by Charles-Noël Martin is a Que sais-je? pocket volume published in late 1958, one year after the launch of Sputnik I. In three parts (theoretical foundations, a history of launches, and a synthesis of results with a prospective outlook) the book explains orbital mechanics, details the technical specifications of the first Soviet (Sputnik I, II, III) and American (Explorer I, III, IV; Vanguard) spacecraft, and synthesizes the first geophysical, ionospheric, and biological data collected. An accurate first-year snapshot of the Space Age (October 1957–October 1958).