Rosetta Mission
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Rosetta mission: Countdown to historic comet landing

Final preparations are under way for what could be one of the most daring feats in space exploration.

On Wednesday, the European Space Agency will attempt to land a tiny spacecraft on a comet.

The comet is 300 million miles away, far beyond Mars, and is racing through space at about 34,000 miles per hour.

David Shukman reports.

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