Unity Node 1
In addition to its connection to Zarya, Unity serves as a passageway to the U.S. Laboratory Module and an airlock. It has six hatches that serve as docking ports for the other modules.
Unity Node 1 is 5.5 meters (18 feet) long, 4.6 meters (15 feet) in diameter, and fabricated of aluminum. It contains more than 50,000 mechanical items, 216 lines to carry fluids and gases, and 121 internal and external electrical cables using 9.7 kilometers (6 miles) of wire.
Related category MANNED SPACEFLIGHT
Text copied from the NASA Unity Node 1 web page.
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