Star Wars fans will be feeling the force today as the blockbuster space saga celebrates its 40th anniversary.

The first film in the hugely successful sci-fi series, Star Wars: Episode IV – A New Hope, was unveiled in the US 40 years ago on May 25 1977.

It arrived in the UK a few months later on December 27 1977.

Made with a relatively small budget of 11 million dollars, the film was a surprise hit and four decades on has spawned a franchise which is estimated to have made more than 7.5 billion dollars at the worldwide box office.

Disney is marking the milestone at some of its stores with events including a Star Wars trivia game, defence training against stormtroopers and Millennium Falcon flight training.

Vanity Fair magazine has four special summer editions celebrating the 40th anniversary of the franchise, with late actress Carrie Fisher appearing on one of the covers.

In the lead-up to her posthumous role as General Leia Organa in Star Wars: The Last Jedi, the full-length photo shows Fisher posing cloaked and regal in her elegant dark outfit.

The other three covers include fully-costumed cast members Adam Driver, John Boyega, Daisy Ridley and Mark Hamill, all taken during an exclusive photoshoot by Annie Leibovitz.

The next film in the series, Star Wars: Episode VIII – The Last Jedi, is due to be released in December.