National Astronomy Meeting: Thursday
b'Dark matter has long been needed by cosmologists to explain how structures like galaxies remain so strongly bound together. Catherine Peymans from the University of Edinburgh tells me about the latest models of dark matter, meanwhile Benoit Famaey and Hongsheng Zhao tell me how they believe that cosmological models can be constructed that don\'t have any dark matter at all. Like this podcast? Please help us by supporting the Naked Scientists'