Commander Chris Hadfield will make a special appearance at the BT Young Scientist and Technology Exhibition in the RDS this January.
Commander Hadfield delighted his one million Twitter followers with regular updates when he was on the International Space Station.
He has a particular affinity to Ireland - his daughter studies at Trinity College Dublin - and was the first person to tweet in Irish from space.
He also made headlines with his interstellar rendition of David Bowie’s Space Oddity.
He'll be at the RDS in Dublin on Saturday, the 11th of January to sign copies of his new book, An Astronaut’s Guide to Life on Earth.
