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Astronaut and author Colonel Chris Hadfield and Open University Planetary Geoscientist, David Rothery join Phil Williams to discuss the landing of the robot probe Philae on a comet. It was, Colonel Hadfield said, a revolutionary achievement and Professor Rothery described his excitement at seeing pictures of the surface of 67 P Churyumov-Gerasimenko. According to Colonel Hadfield we now have an opportunity to investigate the very earliest days of our Solar System and try to work out where "all this" came from. This clip is originally from Phil Williams Wed 12th Nov 2014.
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