Insurance broker Nick Jewitt said statistics showed younger drivers had more accidents and so had to pay more.
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The Kuiper-belt bodies Dr Jewitt and Dr Luu have found range from 100km (60 miles) to 500km across.
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"In random capture, we'd expect a 50:50 split - so we'll be thinking about why the retros are favoured in some way, " says Dr Jewitt.
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Mr Jewitt agreed the costs quoted were expensive but said statistics showing the high number of young people having accidents did not encourage insurance companies to charge lower premiums.
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