In exactly two weeks, Nasa will celebrate the 40th anniversary of one of its most remarkable achievements. On 20 July 1969, Neil Armstrong, "Buzz" Aldrin and Michael Collins reached the moon in Apollo 11.
In this Science Weekly special, we're joined by the mission's biggest fan, author of the new Haynes manual for Apollo 11 Dr Christopher Riley, and the Guardian's David Adam to remember the historic moment and its legacy.
Andy Duckworth has been on location at Nasa in Washington DC to look at out how the US will be marking the anniversary.
Plus, Steven Moss meets the second person to set foot on the moon - Buzz Aldrin - to talk about how he faced the inevitable comedown after such a pinnacle achievement.
Hold onto your seats for blast-off, this is Science Weekly from the Guardian.
