Authors invoked a variety of mechanisms for superluminal travel (or generation starships) and placed their stories on worlds in planetary systems around other stars, an innovation that gave them the freedom to construct exotic fictional planets and themes. Īs science fiction became established in the early 20th century, destinations such as the Moon, Mars, Venus, and other bodies within the Solar System began to seem stale.
One of these is found in Voltaire's Micromégas (1752), which features a traveller from Sirius. The notion that there might be inhabited extrasolar planets can be traced at least as far back as Giordano Bruno who, in his De l'infinito, universo e mondi ( On the Infinite, Universe and Worlds, 1584), declared that "There are then innumerable suns, and an infinite number of earths revolve around those suns, if not exactly as our own, and if not more nobly, at least no less inhabited and no less nobly." Allusions to inhabitants of other stars' planetary systems remained rare in literature for some centuries thereafter. Simak novel serialised in Galaxy Science Fiction Novels 3.151 Proxima Centauri (Alpha Centauri C).
3.24 Alpha Centauri (Rigil Kentaurus/Toliman).
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