Four astronauts have to stay 1000 days in a space station around Earth in order to prove that a trip to Europa, one of Jupiters moon, is possible. The experience goes well until something happens on earth.

四名宇航员被迫在地球附近的一个空间站停留1000天，以求证木卫二——木星的卫星之一是否真实存在。直到地球上劫难的发生，打破了宁静。