In English-speaking nations, a professional space traveler is called an astronaut. The term derives from the Greek words ástron (ἄστρον), meaning “star”, and nautes (ναύτης), meaning “sailor”. The first known use of the term “astronaut” in the modern sense was by Neil R. Jones in his short story “The Death’s Head Meteor” in 1930. The word itself had been known earlier. For example, in Percy Greg’s 1880 book Across the Zodiac, “astronaut” referred to a spacecraft. In Les Navigateurs de l’Infini (1925) of J.-H. Rosny aîné, the word astronautique (astronautic) was used. The word may have been inspired by “aeronaut”, an older term for an air traveler first applied (in 1784) to balloonists. An early use in a non-fiction publication is Eric Frank Russell’s poem “The Astronaut” in the November 1934 Bulletin of the British Interplanetary Society.