For many years optics has been our aid to seeing the world beyond the earth's atmosphere. It seems appropriate that optics should be used to simulate the visual beyond, so as to provide the means to research and train for our ventures into space. Present day optical displays are capable of authentically reproducing the scenes as will be observed through our space vehicles windows. The problem is to provide these simulated scenes with sufficient realism to facilitate use as a research and training device. The emphasis is placed on the dynamic visual cues (behavioral realism) rather than on pictorial representation. Virtual image display has become the byword of visual simulation for its ability to place an image anywhere in the distance. This type of display essentially provides depth perception to two-dimensional images.