What does space smell like? Astronaut Chris Hadfield answers your questions

Canadian astronaut Chris Hadfield became an out-of-this-world celebrity when he covered David Bowie’s “Space Oddity” aboard the International Space Station in May. The video went viral with more than 18 million views. Before that, he had made a name for himself on Twitter with stunning pictures of the Earth from space. He used YouTube to show Earth-bound humans how to trim their nails, cry, sleep and eat in micro-gravity.

Hadfield recently retired and the former commander of the I.S.S. has his feet firmly back on Earth again. He sat down recently with Miles O’Brien in New York to talk about the life of an astronaut, the future of space exploration and his new book “An Astronaut’s Guide to Life on Earth.” That conversation will air on the PBS NewsHour.

He also answered your burning questions from Twitter: what does space smell like? Did he have weird dreams in space? How did he record “Space Oddity”? What did he really think of the movie “Gravity”? The video above has his answers.