(Canadian Space Agency/Chris Hadfield ) Canadian astronaut Chris Hadfield floats inside the International Space Station clad all in green for St. Patrick's Day on March 17, 2013.
Astronaut Celebrates St. Patrick's Day in Space
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MARCH 17, 2013
Tariq Malik, Space.com

You don't need gravity to have a great St. Patrick's Day, just ask astronaut Chris Hadfield on the International Space Station.
Hadfield, a Canadian Space Agency astronaut, is celebrating the Irish holiday in orbit by wearing a green shirt and a bright green bow tie Sunday while photographing Ireland from space.
"Maidin mhaith from the International Space Station! Happy Saint Patrick's Day to the Irish all around the globe. Good morning!" Hadfield wrote in one of several Irish-themed Twitter posts today. Maidin mhaith is Gaelic for "Good Morning."
Read more: NBC News Science