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NASA HQ director of planetary science Jim Green and leading astrophysicist Prof Tim O'Brien explain the significance of NASA's announcement of the discovery of liquid water on Mars.

Putin and Obama hold face to face talks at the UN in New York as attempts are stepped up to resolve the Syria crisis.

Steel industry expert Jonathan Aylen discusses the impact of the mothballing of the SSI iron and steel plant on Teesside.

Labour's spokesman on policing Jack Dromey on shadow chancellor John McDonnell's speech to the party conference in Brighton.

Natalie Jamieson and Andy Halls run through the entertainment stories of the week in Back Row, including Sam Smith's Bond theme, ructions in Celebrity Big Brother, the reworking of a musical Rugby World Cup favourite, and how Ridley Scott sought to ensure authenticity in his new film The Martian.

Plus: from the best places for a romantic proposal to Christmas getaways, Simon Calder explains the latest travel tips and advice for would-be travellers in the Midnight Hour.