Note that the image of the planetscape below is a matte painting based on the same photograph used by Cinema Research Corp, which did the original visual effects for the episode in 1969. The original planet view was based on a photograph of the Hadramawt Plateau dry river basin in southern Saudi Arabia. The photo was taken by astronauts on the Gemini IV mission in 1965. For the remastered visual effect, Dwayne A. Day of the National Research Council and John Hargenreder of the NASA History Office combed through NASA archives at NASA Headquarters in Washington D.C. to find the original photograph for the remastered visual effects team. The distant mountains on the horizon are from a different photo, taken by astronauts on the International Space Station.