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A former director at the European Space Agency says the landing of the Philae probe on a comet was like watching a "birth". David Southwood, former ESA director of space and robotic exploration, became involved with the project 20 years ago. He said the landing was a "big step" for the world and an "incredible achievement" for everyone involved. "It's like having a baby born... You've been waiting and suddenly everything is there in front of you. This is discovery." This clip is originally from Drive on 12 November 2014.