HE delighted close to half-a-million Twitter followers with his historic tweets in Irish and stunning night-time photos of Dublin twinkling from space.
And once he literally comes back down to Earth, Canadian astronaut Cmdr Chris Hadfield hopes to return to the Irish capital, where his only daughter is currently a student.
Cmdr Hadfield (52), who is orbiting the Earth aboard the International Space Station, has attracted a legion of followers here and around the world after his tweets and stunning photos of major cities and landmarks from space captured the imagination of people from around the globe.
He received more than a thousand re-tweets in half-an-hour from Gaelic speakers on Tuesday, who were delighted when he tweeted a greeting in Irish marvelling over Ireland's exquisite "land of green hills and dark beer. With capital Dublin glowing in the Irish night."
And it won't be his last "flying visit" here, according to his daughter Kristin (26). The PhD student at Trinity College's School of Psychology said her father loved the Irish capital when he visited in 2011.
They took in a few GAA matches at Croke Park and attended films at the Dublin Film Festival, as well as going for a hike around Glendalough, Co Wicklow.
"He had a great time in Ireland. He'll definitely be back for my graduation, but that's a few years away, so hopefully he'll visit before then," she told the Irish Independent.
Ms Hadfield has been living in Dublin for the past two years. Like her father, she loves Ireland.
"I wish the weather was a bit more co-operative, but otherwise it's great," she said.
After her father's Irish tweet and photo of Dublin made headlines around the world, Ms Hadfield said she was even more proud of her father, who has been dubbed "Commander Cool" after he received tweets from fellow astronaut Buzz Aldrin and the original cast of the hit TV series 'Star Trek.
"I loved it! It's kind of incredible to think that he is in space, looking down at all of us here in Ireland," she said.
"He sent me the picture before he posted it just to make sure that he had the location correct, because he once posted a picture and didn't realise it was of Dublin," she said of another incident in December which also made headlines.
She added: "My Dad is a pretty inspiring person and I couldn't be prouder of him."