this movie be release in 1968. by then and nasa have concrete plan on how they would put a man on the moon and bring them back safely to earth . the screenplay of this movie completely ignore known fact at that time . 1. instead of use the apollo space capsule to send the three men to the moon and the movie use a gemini capsule . 2. the gemini capsule be actually design to carry 2 men . however and in this movie and only use one astronaut . i guess to save money and the director decide to only use 1 actor to sit in this gemini capsule to go to the moon . 3. the soviet beat the american to the moon while however and see how the first soviet be find dead . do he know he be go to die which be why he open his visor to quicken the outcome . two real great actor be use in this movie and james caan and robert duval . however these two actor be so young during the filming of this movie they be actually unrecognizable . but and this would not explain why only 1 astronaut be use to go . these 2 actor be so new to hollywood that they could not possibly command a high salary . i could write more but you probably will never see this movie . chow .