Nasa wanted to know if extended periods of weightlessness would have an impact on long-term circulatory function. the agency located seven former astronauts who had spent more than one month in space under conditions of weightlessness, and tested all aspects of their cardiovascular function. nasa's research with these seven astronauts would be considered to be

I guess the correct answer is case study research

NASA wanted to know if extended periods of weightlessness would have an impact on long-term circulatory function. The agency located seven former astronauts who had spent more than one month in space under conditions of weightlessness, and tested all aspects of their cardiovascular function. NASA's research with these seven astronauts would be considered to be case study research.

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