"J" marks primary landing site for the Rosetta mission
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Rosetta: 'Audacious' comet landing site chosen

Scientists and engineers have spent weeks studying the 4km-wide "ice mountain" known as 67P, looking for a location they can place a small robot.

They have chosen what they hope is a relatively smooth region on the smaller of the comet's two lobes.

But the team is under no illusions as to how difficult the task will be.

Comet 67P/Churyumov-Gerasimenko, currently sweeping through space some 440 million km from Earth, is highly irregular in shape.

David Shukman reports.

Go to next video: Close-up look at Rosetta comet lander