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Astronaut Jim Voss has enjoyed many memorable moments in his career，including three space flights and one space walk. But he recalls with special fondness a decidedly
earthbound (为地球所吸引)experience in the summer of 1980，when he participated in the NASA
-ASEE Summer Faculty Fellowship Program. Voss then a science teacher at West Point，was
assigned to the Marshall Space Flight Center’s propulsion(推进)lab in Alabama to analyze why a
hydraulic fuel pump on the space shuttle was working so well when previous seals had failed. It
was a seemingly tiny problem among the vast complexities of running the space program. Yet it was
important to NASA because any crack in the seal could have led to destructive results for the
astronauts who relied on them.
“I worked a bit with NASA engineers，”says Voss，“but I did it mostly by analysis.
I used a handheld calculator，not a computer，to do a thermodynamic(热力学的)analysis.”
At the end of the summer，he，like the other NASA-ASEE fellows working at Marshall，summarized his f’indings in a formal presentation and detailed paper.
