Media playback is unsupported on your device

Mars mission: Dennis Tito proposes manned trip

27 February 2013 Last updated at 20:46 GMT

An American billionaire who was the world's first space tourist has announced plans for a manned mission to Mars, which would launch in January 2018.

Dennis Tito said technological and scientific progress in outer space had been "outstanding", but "we've not sent humans beyond the moon in 40 years."