Robert Thirsk, who holds the Canadian record for most time spent in space at nearly 205 days, says there will always be risks in space travel, but the personal, professional and scientific benefits of serving as an astronaut and representing Canada on an international mission will always outweigh those risks. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS For breaking news, video, audio and in-depth coverage: https://www.cbc.ca/news Follow CBC News on TikTok: https://www.