From the conference hall

There's a packed out conference hall for this afternoon's lecture programme which features William McKinnon on the Galilean Satellites, Mark Sullivan on the accelerating Universe, Jill Tarter on the first 50 years of SETI and Allan Chapman on 'Aliens: a history from Selenites to ET'.

Conference chair Ian Ridpath introduces the afternoon session.

Professor McKinnon kicks session two off with a grand tour of the Galilean Satellites - 400 years after they were first discovered by Galileo.