Żewġ vapuri jiggwidaw il-fruntieri biex jipprevjenu l-invażjoni mhux mistennija ta 'għedewwa aljena. Huma għandhom immanuvrar kostanti matul l-istrixxa ta 'aljenazzjoni, jevadu l-biċċiet li jtajru b'mod kostanti ta' asteroids. Operat il-vleġeġ u l-AD biex jipprevjenu kolliżjoni.
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