Chris Hadfield, the astronaut who captured the hearts and minds of the nation this year with his photos of Ireland and tweets in Irish from space, hooked up with the Chieftains for a performance of Moondance.
Their version of the Van Morrison hit on planet earth followed their intergalactic duet last March.
Speaking to Independent.ie the Canadian astronaut said his tweets from space were to help us "see the world as one fragile place where we all live." He wanted to give his 1m Twitter followers the sense of perspective that you can only get from "orbit."
Speaking in the Science Gallery in Trinity College where his daughter Kristin studies psychology he told a private audience of over 100 people that his fear of heights never stopped him fulfilling his childhood dream of becoming an astronaut even when he went temporarily blind on his first spacewalk.
The former commander of the International Space Station was here to promote his new book An Astronaut's Guide to Life on Earth signing copies of it in Eason's, O'Connell St where it sold out in a matter of hours.
He took to Twitter once again to thank an anonymous man who bought copies of the book in other shops and handed them out to children waiting in the long queue that wrapped around on to Abbey St.
"I heard a man bought books at other shops & gave them free to bookless children in line at Eason's. So nice - hero! Who was he? Anyone know?
Mr Hadfield was interviewed for the Breakfast show on Newstalk to be aired on Monday morning alongside the exclusive performance of Moondance with the Chieftains.
After the song Paddy Moloney presented the astronaut with a bodhran signed by the music group.