Thirteen to Centaurus (1965)

Interstellar travel at sub-light speeds: the enormous distances, isolation from human culture and the aching loneliness of space are enough to drive the strongest personality insane. Better to block all memories of human contact and to program the 12-strong crew to accept only the reality they can see and touch within their spacecraft. But a child born on "the Station" becomes insistent on learning the truth about 'Outside'.