Kathryn Boast gives a talk about dark matter: what it is, what we know about it, and what the limitations of our knowledge are.
Dark Matter - Are we still in the dark?
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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/