 There is no musical score for this film. Instead, each spacecraft  has its own ambient soundtrack when it is shown in space. The Apollo  shots feature a low hum; the XRV, a hollow ringing; the Nimbus  Weather Satellite, a rapid series of beeps ascending in pitch; and  the Russian Voshkhod, a constant pitch series of beeps. The only  exceptions to this is are a very slight, muted bit of music played  under the Apollo ambient soundtrack during Pruetts final EVA, and a  single tone (with some ambient effects that could be called music)  during the opening credits.