Astronauts added a new room to the international space station on Friday in the way of Harmony.
That's the name of the school bus-size compartment that was attached by a team of spacewalkers working outside and robot arm operators working inside.
"I don't know that anybody's ever told our crew that we bring harmony with us, but we sure bring fun," Discovery's commander, Pamela Melroy, said as the spacewalk ended and the congratulations began.
The Italian-built Harmony — 24 feet long and 31,000 pounds — was unloaded from the shuttle's payload bay and hoisted into place by the space station's robot arm. It is a temporary location; it will be moved to its permanent spot once the shuttle leaves. European and Japanese laboratories will latch onto Harmony in the coming months.
"Now the crews that are hot on our heels have a place to come," spacewalker Scott Parazynski said.
It was the first of five spacewalks planned during Discovery's space station visit, and the first pressurized compartment added to the orbiting complex in six years.
The space station's living space grew by 18 percent with the addition of Harmony. The astronauts will enter Harmony on Saturday.
NASA confirmed Friday that Discovery's astronauts will not have to conduct any more inspections for launch damage and that the shuttle's thermal shielding appears to be in good condition for the Nov. 6 re-entry. An inspection will be done two days before landing, however, to check for any possible impacts from orbital debris.
Parazynski and his spacewalking partner, Douglas Wheelock, helped prepare Harmony for the demanding robot arm operation by Stephanie Wilson and Daniel Tani.
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Month in Space: January 2014
The two spacewalkers also disconnected ammonia coolant lines from a giant girder that will be moved along with a set of solar wings to another spot on the space station next week. They put covers over a radiator and electrical boxes on the girder to keep them warm.
While working with the ammonia lines, Parazynski encountered several drops of ammonia ice crystals that floated his way. His spacesuit did not seem to be contaminated. Nevertheless, both spacewalkers tested themselves before re-entering the cabin to make sure none of the toxic substance was brought inside.
Parazynski and Wheelock constantly checked the condition of their gloves during their six hours outdoors. An astronaut tore his glove on a sharp edge of the space station in August, and another did the same last December.
The two enjoyed the unobstructed view from 215 miles up.
"You just can't recreate that color blue on Earth, I don't know why," Parazynski said.
The next spacewalk is Sunday, when Parazynski and Tani will go out to install spacewalking handrails and other equipment to the outside of Harmony.
They also will take a look at a rotary joint for the space station's solar wings that has exhibited electrical current spikes in the past 1 1/2 months. Thermal blankets or bolts might be hanging up this starboard joint — launched earlier this year — and putting extra friction on it, said Kirk Shireman, deputy space station program manager.
The joint is necessary for turning the solar wings toward the sun.
