Countdown was a British comic published weekly by Polystyle Publications – ultimately, under several different titles – from early 1971 to late summer 1973. The pages in each issue were numbered in reverse order, with page 1 at the end – a gimmick which was derived from the comic's title in order to create a countdown to the number one every week. A notable feature of Countdown was the inclusion of nonfiction articles about current space exploration which often included a level of technical detail more typical of technical trade journals aimed at adult professionals.