A popular book on space exploration and the long-term future of a spacefaring humankind is not a place where one would immediately think of finding quotations by Voltaire. But Pale Blue Dot by the famous US astronomer Carl Sagan is inspired by Voltaire’s writings in several places.
Sagan’s chapter 3, ‘The Great Demotions’, is prefixed by an epigraph from Micromégas, a philosophical tale by Voltaire. In this quotation, a human philosopher tells two celestial visitors, one from Sirius and the other from Saturn, that they, their worlds and their stars were created solely for the use of man: ‘At this assertion our two travelers let themselves fall against each other, seized with a fit of inextinguishable laughter.’ A fitting introduction to a chapter relating how scientific discoveries have progressively marginalised humanity’s conception of its place in the universe – the Copernican revolution in thought, with which Voltaire was clearly in sympathy. The message is reinforced in another quotation from Micromégas, in which Voltaire describes how the cosmic travellers eventually discovered ‘a small light, which was the Earth’, but even then were unable to find ‘the smallest reason to suspect that we and our fellow-citizens of this globe have the honor to exist’. The minuteness of planet Earth and of its human inhabitants in the enlightened cosmic perspective is the main theme of Sagan’s book, which takes as its starting-point a series of 60 photographs taken by the Voyager 1 space probe in 1990, after it had passed beyond the orbits of Neptune and Pluto. From Voyager’s vantage point 6 billion kilometres distant, Earth appears as a single bluish pixel of light, the ‘pale blue dot’ of the book’s title, just as Voltaire’s travellers would have seen it. Yet, after decades of outbound flight since its launch in 1977, Voyager 1 has still only travelled a small fraction of the distance that separates us from Sirius, one of the closest stars to our Sun, and the home of one of Voltaire’s fictional aliens (Voyager is currently about one part in 4500 of that distance away from us).
A quotation from Voltaire’s Memnon puts humanity in its place in another way: ‘our little terraqueous globe is the madhouse of those hundred thousand millions of worlds’ (in a footnote, Sagan approves the accuracy of that order of magnitude figure given current knowledge). Yet there is not only mockery of our pretensions and self-importance, but hope for the future, too, for Sagan was an optimist who saw an opportunity for our descendants to become cosmic travellers, just as Voltaire describes his aliens doing in Micromégas: ‘Sometimes by the help of a sunbeam, and sometimes by the convenience of a comet, [they] glided from sphere to sphere, as a bird hops from bough to bough. In a very little time [they] posted through the Milky Way’ (according to the translation in Pale Blue Dot). In order to achieve such a future without destroying itself in the process, humankind must order its affairs in a more enlightened manner: such is Sagan’s message. Voltaire would surely have agreed: his historical writings which have passed across my desk on their way to typesetting are full of scathingly critical comments about the crimes committed by popes, kings and emperors, and they express his horror at the tortures and injustices inflicted by members of one religious sect on another.
Yet in the end, it seems, Voltaire could not shake off his doubts. In an article entitled ‘Voltaire’s astronauts’, William Barber points out that when Voltaire wrote of the material inhabitants of other planets visiting Earth, during the 1730s, both his scientific enthusiasms and his personal contentment were at their height: ‘Man is in his rightful place in a Newtonian universe where order and reason prevail.’ But the evils and misfortunes of life subject such optimism to severe strain, and Voltaire later found it necessary to construct tales of metaphysical visitors, such as the angel Jesrad in Zadig (1747), who it was hoped would bring divine consolation and reassurance that all really was well. This they were unable to achieve, at least in Voltaire’s stories, because their religious prestige was tarnished, Barber writes, ‘derived from a world-view already rejected’. Again, Katherine Astbury notes at the end of her edition of Memnon for OCV (a conte which was closely related to Zadig): ‘Memnon’s refusal to accept the view of his guardian angel and submit to providence is a reflection of Voltaire’s dissatisfaction with optimism in general and Pope’s view of the universe in An Essay on man in particular.’ We, too, face conflicts between optimistic visions of a civilisation steadily gaining wealth and knowledge and expanding out into the cosmos, versus pessimistic ones of our imminent destruction through climate change, nanotechnology, the information revolution, peak oil or other causes. Hopefully, with the longer perspective allowed us by 250 years of scientific progress to which Voltaire was not privy, we have more reason to maintain our optimism than he did. – Stephen Ashworth References Pale Blue Dot (Headline, 1995) is an accessible popular book by a widely respected scientist giving his views on the planetary explorations in which he took part and on the future prospects for our species. Carl Sagan quotes from or references Voltaire on pages 25, 34, 35, 59, 394, 397. Micromégas is available in Romans et Contes, ed. Frédéric Deloffre and Jacques van den Heuvel (Paris, Gallimard [Pléiade], 1979). Its publication in OCV is provisionally scheduled for vol.20C in 2018. It is available online in French (TOUT VOLTAIRE) and in English translation (Project Gutenberg). Memnon and Zadig are published in OCV, vol.30B. W.H. Barber’s article ‘Voltaire’s astronauts’ appeared in French Studies 30 (1976), p.28-42, available online (subscription required).