Rosetta comet probe: How Philae vehicle will land on comet

Subscribe to BBC News Subscribe to BBC News HERE http://bit.ly/1rbfUog David Shukman explains how the European Space Agency will attempt to land a small spacecraft on a speeding comet for the first time. Check out our website: http://www.bbc.com/news Facebook: http://www.facebook.com/bbcworldnews Twitter: http://www.twitter.com/bbcworld Instagram: http://instagram.com/bbcnews

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