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On the other hand, if there is at least one stable shadow particle that has mass, does not decay and avoids annihiliation, it could be that relict shadow matter contributes a good deal to the present gravitational dynamics of the universe.
By contrast, across the Severn Bridge we witness two 50-point annihiliations, Gloucester whipped 53-6 at Northampton and, perhaps more disturbingly, London Welsh obliterated 52-0 on their own Oxford patch by Exeter Chiefs.