They will investigate the psychological and medical aspects of a long-duration space mission, preparing for future human missions to the Moon and Mars.

志愿者们将评估长期封闭的环境对人类造成的生理和心理影响，为未来的月球、火星之旅积累经验。

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In a speech, Dr Fox said the Strategic Defence and Security Review had allowed for "one long enduring mission like Afghanistan" and one shorter programme "of about six months' duration".

BBC: Liam Fox denies 'six-month Libya 'deadline'