Under the command of two experienced astronauts, a relatively untested crew set off on the Antares, a six year mission to seven planets in our solar system. The two senior astronauts, Maddux Donner and Ted Shaw, are a last minute substitute when those assigned to the mission are removed for medical reasons. Both had been on a mission to Mars 10 years before where they were forced to leave two of their party behind. Several others on the flight are also carrying personal baggage including Zoe Barnes, who is haunted by the sounds of a crying baby.