Jim Hennesey, spokesman for The Sarens Group, explains the Endeavour's journey.
The Sarens Group teamed up with Toyota to create the dolly used to haul the US space shuttle through the streets of Los Angeles.
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Accompanied by the Duke of Edinburgh, the Queen will attend the opening ceremony of the fifth session in the Holyrood chamber.
Ms Leadsom has received the backing of Ian Duncan Smith, the former work and pensions secretary.
The former shadow work and pensions secretary is considered a more viable candidate than Angela Eagle, a Labour source has told ITV News.