Remember, the movie was released in 1968, when the U.S. had a very active space program.

请记住， 这部电影于 1968 年上映，当时美国的太空计划非常活跃。

It probably comes from the 1960s and 70s, when the United States had an active space program.

它可能来自 1960 年代和 70 年代， 当时美国有一个活跃的太空计划。