Horizon goes behind the scenes at Nasa to discover how it is preparing for its most ambitious and daring mission: to land men - and possibly women - on the surface of Mars. <br /> <br />It's over 40 years since Neil Armstrong made the first human footprint on the moon. But getting to the red planet would involve a journey of at least three years. <br /> <br />Horizon meets the scientists and engineers who are designing new rockets and space suits, and finding ways to help astronauts survive the perils of this long voyage. <br /> <br />And it turns out that having the 'right stuff' for a mission to Mars might not be quite what you expect.
