The Sky at Night the 55 years of Moore's tenure that he did not host the programme. Brian May, the Queen guitarist and astrophysicist, has been a guest on the show from time to time. On 1 April 2007, Moore presented the 50th Anniversary edition of the show, a special "time travel" edition which included the appearance of Jon Culshaw as Moore's younger self. The 50th anniversary programme was filmed at Teddington Studios as the 1957 home of the programme, Lime Grove Studios, had been demolished in 1992. On 6 March 2011, Moore presented the 700th edition of the show, a special retrospective episode
The Sky at Night something less common, such as a comet or a meteor shower, is present. Explaining the show's enduring appeal, Moore said: "Astronomy's a fascinating subject. You look up... you can't help getting interested and it's there. We've tried to bring it to the people.. it's not me, it's the appeal of the subject." Many of the world's leading astronomers have appeared on the show through the years, including Harlow Shapley (the first to measure the size of the Milky Way galaxy), Fred Hoyle, Carl Sagan, Jocelyn Bell Burnell, Samuel Tolansky, Harold Spencer Jones, Martin Ryle, Carlos Frenk and Bart Bok. Other