On 18 February 1930, twenty-four-year-old Clyde Tombaugh at Lowell Observatory in Flagstaff, Arizona, discovered Pluto by comparing photographic plates of the night sky taken days apart. Named for the Roman god of the underworld, it was hailed for decades as the ninth planet before being reclassified as a dwarf planet in 2006. Pluto's discovery caught the cultural imagination, inspiring poetry and fiction drawn to its remote, frozen, mythically resonant existence at the solar system's edge.

The discovery of Pluto in 1930 added a distant world to the solar system, inspiring mid-20th-century poets to reflect on the unknown. This celestial exploration influenced literature that grappled with themes of existence, isolation, and the vastness of the universe.