Right now, astronauts Rick Mastracchio and Michael Hopkins are outside of the International Space Station in only the second Christmas Eve spacewalk in NASA history. They are repairing one of the ISS' two coolant loops after it shut down on Dec. 11th. The last spacewalk on Christmas Eve happened in 1999 when astronauts worked repairs on the Hubble Space Telescope. 

Watch live here:

Live streaming video by Ustream

[via NASA]