Sir Patrick Moore celebrates the 700th episode of The Sky at Night at his home in Sussex, with the help of guests Brian Cox, Jon Culshaw and the Astronomer Royal.

Sir Patrick Moore celebrates the 700th episode of The Sky at Night at his home in Sussex, with the help of special guests Professor Brian Cox, impressionist and amateur astronomer Jon Culshaw and Lord Martin Rees, the Astronomer Royal. A stellar panel of astronomers gathers to answer vexing questions from the viewers, while Sir Patrick has a close encounter with his younger self.