Right now Chris Hadfield is in the ISS (International Space Station). The ISS travels faster than a bullet and is the size of a football field. On the ISS there is zero gravity ( that means everything floats).
From Space Chris Hadfield tweets and something like skype. You could message him but he probably would not answer you because he has 300,000 people messaging him already.
On February 22 from 8:00-9:00 AM he will be doing a google hangout (something like skype) and answer other peoples questions. On February 22 we might open the school early to watch the google hangout.
If you have any more facts about space please tell me in your comment.