An astronaut on a space station is moving away from earth at 0.6 c. A spacecraft manned by a different astronaut is heading towards him in the direction of earth at 0.6 c relative to the space station. Mission control sits on earth and observes both crafts. The first astronaut watches a film in his space station. All three observers time how long the film takes. Who measures the film’s proper time?

An astronaut on a space station is moving away from earth at 0.6 c. A spacecraft manned by a different astronaut is heading towards him in the direction of earth at 0.6 c relative to the space station. Mission control sits on earth and observes both crafts. The first astronaut watches a film in his space station. All three observers time how long the film takes. Who measures the film’s proper time?

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