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Subscribe to BBC News Subscribe to BBC News HERE “It's landed - I've waited years for this“, Professor Monica Grady has said, on finding out that the robot probe Philae had landed on a comet. The landing caps a 6.4 billion-kilometre journey that was begun a decade ago. Prof Grady of the Open University worked on a tool of the project called Ptolemy - a shoe-box-sized gas analysis instrument. She was in on the Philae lander project from its earliest days and jump
