In the second of three spacewalks planned during Endeavour's mission, astronauts Robert Behnken and Nicholas Patrick worked on Saturday (February 13) to outfit Tranquility a new connecting hub to the International Space Station.

Among their tasks, the astronauts successfully connected two ammonia loops to Tranquility to install the module's cooling system, according to NASA's website.

Tranquility, made in Italy, takes its name from the site where U.S. astronauts first landed on the moon in 1969.

As a second habitation module for the live-aboard station crew, Tranquility will house a toilet, oxygen generator, air scrubber and water recycling system.

Four more shuttle missions remain to finish outfitting the station before NASA retires its three-ship fleet at the end of the year.

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