For the latest in our “Ask an Expert” series, current NASA astronaut Donald Pettit and former astronaut Jeffrey Hoffman chat about their spaceflight experiences. From brushing your teeth to weightless dreams, the astronauts discuss the many curiosities of living in space.
Don Pettit is a NASA astronaut at NASA’s Johnson Space Center in Houston, Texas.
Jeffrey A. Hoffman
Jeffrey A. Hoffman is a former NASA astronaut and an aerospace engineering professor in the department of aeronautics and astronautics at the Massachusetts Institute of Technology in Cambridge, Massachusetts.
Meet the Producer
About Denise Chow@denisechow
Denise Chow is a sci-tech editor at Live Science and a former associate producer for Science Friday.