Dennis Tito
Media playback is unsupported on your device
Video

Mars mission: Dennis Tito proposes manned trip

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."

Go to next video: Plans for Mars mission announced