The international space station began construction 10 years ago. It has been permanently occupied for the past eight years by joint Russian and US crews, but the station remains incomplete and costs are spiralling out of control. Science correspondent Pallab Ghosh describes the history of the $100bn mission. Dr Chris Riley argues the station is a 'monument of what we can do' while Lord Rees, president of the Royal Society, dismisses the project as a waste of money.
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