In this talk Jocelyn Bell Burnell talks about the reclassification of Pluto to a Dwarf planet and the history of its discovery.
Pluto - no more a planet
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Find out more about our night sky, from new planets to far-off galaxies and the vastness of the Universe. A series of short talks and presentations for the general public from leading astronomy researchers at the Oxford University Physics department - http://www.physics.ox.ac.uk/