It's called I.S.S. (Is Somebody Singing?). ISS can also stand for "International Space Station," which is fitting since the song is about what it's like to leave the Earth and go into space.

Hadfield has done some incredible things during his time on the ISS. He has made his experience in space accessible to the people on Earth.

He has tweeted messages, conducted live media conferences, sent photos and kept people up-to-date on what the astronauts on the Space Station are doing.

What Hadfield is doing is unique. No astronaut has ever brought space so close to Earth before.

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