故事发生在不远的未来,来自五个国家的八名航天员将执行一项神秘的太空计划。在长达六年的时间里,他们将穿越整个太阳系。In the near future, eight astronauts from five countries (four women and four men) undertake a mysterious six-year international space mission covering thirteen billion kilometres. With the eyes of the world upon them - everything they do is monitored, and every emotion they feel, scrutinized - they soon discover that their real assignment is not at all what they thought.