Columbus can now be grappled by the ISS robot arm.
Nearly half way through the spacewalk, Rex Walheim and Stan Love were about 20 minutes behind schedule, which was not seen as a problem.
The pair has installed the power data grapple fixture and are removing shields to attach power cables that will heat the Columbus module while it is moved to the ISS' Harmony module.
The 102nd spacewalk to build the ISS began at 9:13 a.m. EST and will last 6.5 hours.
Walheim wears a spacesuit with solid red bands. His helmet camera is No. 16. Love's suit has broken red stripes. His helmet camera is No. 18.
Later today, the pair will prepare a nitrogen tank for installation on the ISS during Wednesday's spacewalk.
Also today, the Columbus module will be moved by the station robot arm to its berth on the space station, where it will be attached with motorized bolts. The laboratory will be opened Tuesday.
Click for STS-122 fact sheet.
Click here for the flight day 5 execute package.
Click here for the NASA-TV schedule, which details mission events.
Spacewalkers: Walheim (left) and Love
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