 Voltaire's short story "Micromégas" (1752), about alien visitors from Sirius and Saturn, also describes Mars as having two moons.Voltaire is thought to have been influenced by Swift.In recognition of these mentions, many geological features of Phobos and Deimos are named after characters and places from "Gulliver's Travels", including among others "Laputa Regio" and "Lagado Planitia" on Phobos, and craters Swift and Voltaire on Deimos.