"Gravity" had its world premiere at the 70th Venice International Film Festival on August 28, 2013, and had its North American premiere three days later at the Telluride Film Festival. It was released in the US in RealD 3D and IMAX 3D on October 4, 2013, and in the UK on November 1, 2013. The film's US release coincided with the beginning of World Space Week, which was observed from October 4 to 10. The film was originally scheduled to be released in the US on November 21, 2012, before being rescheduled for a 2013 release to allow the completion of extensive post-production work.