Newsnight - 20/09/2010

In-depth investigation and analysis of the stories behind the day's headlines with Jeremy Paxman. Kirsty Wark is at the Liberal Democrats' conference in Liverpool with in-depth reaction to Nick Clegg's speech, plus an interview with Business Secretary Vince Cable about current policy issues. Newsnight's 2010 party conference game is unveiled; Mark Urban asks if the British forces' security handover to US forces in Sangin is a tactical withdrawal; and Susan Watts considers how worrying Nasa's solar flare warning and the possibility of the Earth's lights going out is.