Sputnik Planum

== Translingual == === Etymology === From being originally believed to be an elevated plain (a planum; from Latin planum). named after the first artificial satellite, Sputnik 1. From Russian спу́тник (spútnik). === Proper noun === Sputnik Planum (planetology) former name of Sputnik Planitia: a plain in Tombaugh Regio, Pluto, Solar System