Rough Flight Path for NASA Science

Support for human space flight puts squeeze on academic research

Jack L. Mullen had hoped that his unusual field of study — how gravity affects the growth of plants — might one day help the National Aeronautics and Space Administration send astronauts on long, multiyear space flights.

In 2004, Mr. Mullen, a postdoctoral researcher at Indiana University at Bloomington, and his faculty adviser landed a three-year grant from NASA, worth $499,000. Among other

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