Remember Col. Chris Hadfield? Pretty big news last year, went into space, tweeted a lot, took some really nice pictures of Ireland, etc...
Well, now's your chance to meet a real-life astronaut as Col. Hadfield himself will be signing copies of his new book 'You Are Here' in Dublin this weekend.
He'll be at Eason's on O'Connell Street from 4.30pm - 7pm tomorrow (Saturday) and Dubray Books on Grafton Street on Sunday from 11am - 1pm.
The book is a collection of all of the amazing photographs he took of Earth from his view on the International Space Station.
Here's his picture of Dublin: