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The film follows a hypothetical proposition: a group of astronauts are circling the earth in a spacecraft, but they cannot return, as our planet has become uninhabitable. The cause of this remains open - all-out war, outbreak of a new disease beyond control, radiation after the complete disappearance of the ozone layer, or whatever. The crew of the spacecraft has to find a more hospitable place out there in space, and releases a probe from their cargo bay, Galileo. But it would seem that Galileo - after sending back very disquieting data - has been sent on a suicide mission...