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b'He is known for his breakthrough physics and popularizing of science, but Dr. Hawking also wanted to fly in space. Erik Viirre led the medical team that helped Stephen experience weightlessness.\\xa0 He says the adventure helped open the possibility of spaceflight for many more people.\\xa0 Planetary Society co-founder Louis Friedman and Society CEO Bill Nye share their memories of the great physicist.\\xa0 Bruce Betts doesn\\u2019t let a bad cold get in the way of the What\\u2019s Up segment.\\xa0 Learn more about this week\\u2019s topics and see images here: http://www.planetary.org/multimedia/planetary-radio/show/2018/0321-stephen-hawking-zero-g.html'