planemo n. an object in outer space with mass insufficient to achieve fusion but large enough to be made roughly spherical by its own gravity. Editorial Note: This term and meaning were derived by way of determining what characteristics, exactly, should constitute a planet. Etymological Note: Coined by Gibor Basri from planetary mass object. (source: Double-Tongued Dictionary)
Further reading
Outer space, used with its modern meaning, appears as early as the 1840s in a poem by Emmeline Stuart-Wortley. Soon after, Alexander von Humboldt was using variations on it in his writings about the cosmos. By 1901, H.G. Wells was using outer space...
Need a book to lift you out of this world? Try Orbital (Bookshop|Amazon). In it, Booker-winning novelist Samantha Harvey imagines the moment-to-moment experience of living on a space station, a mixture of the mundane and the majestic, 250 miles...