Retired Canadian astronaut Commander Chris Austin Hadfield was the first Canadian to walk in space.

An engineer and former Royal Canadian Air Force fighter pilot, Hadfield has flown two space shuttle missions and served as commander of the International Space Station from December 2012 and March 2013.

It was during his time aboard the ISS that the 54-year-old took social media by storm.

Using his Twitter feed and a high-powered camera, Chris used his unique vantage point to give a rare insight into the beauty of planet Earth, as well as the banalities of life on the space station, to hundreds of thousands of his followers, in turn inspiring new interest in space exploration.

On the eve of his return to earth, the former farm boy posted a video to YouTube of him singing an adapted version of David Bowie's song "Space Oddity".

The clip, which showed the astronaut floating around the inside of the ISS with his guitar, with Earth visible through the station’s cupola window, helped Chris set a new world record for First music video filmed in space.

We’ll be speaking to Chris later this week and we’re giving you the chance to ask him questions about his incredible career as an astronaut.

You can leave your question in the Facebook comments at the foot of the article or tweet them to @GWR with the hashtag #askGWR.

We’ll be putting the pick of the questions to Chris for a feature which we’ll be publishing on this site soon.