Editing Unity (ISS module) (section)

== Details ==
[[File:Unity module interior.jpg|thumb|upright=1.0|right|Interior of Node 1 ({{asof|2005}})]]

Essential space station resources such as fluids, environmental control and life support systems, electrical and data systems are routed through ''Unity'' to supply work and living areas of the station. More than 50,000 mechanical items, 216 lines to carry fluids and gases, and 121 internal and external electrical cables using six miles of wire were installed in the ''Unity'' node.<ref name="NASA_unity">{{cite web|url=http://www.nasa.gov/mission_pages/station/structure/elements/node1.html#.Un1ZUZGViqQ|title=Unity Node|publisher=NASA|access-date=8 November 2013|archive-date=14 June 2014|archive-url=https://web.archive.org/web/20140614151305/http://www.nasa.gov/mission_pages/station/structure/elements/node1.html#.Un1ZUZGViqQ|url-status=dead}} {{PD-notice}}</ref> The primary structure of Unity is constructed of [[aluminium]].<ref name=NASA-Unity-CM-1999>{{cite web |url=http://spaceflight.nasa.gov/spacenews/factsheets/pdfs/unity.pdf|archive-url=https://web.archive.org/web/20000817055811/http://spaceflight.nasa.gov/spacenews/factsheets/pdfs/unity.pdf|url-status=dead|archive-date=2000-08-17|title=NASA Facts: ''Unity'' Connecting Module: cornerstone for a Home in Orbit|publisher=NASA|date=January 1999}} {{PD-notice}}</ref> 

During the space station construction, a crew member placed two speed limit signs on the hatch (leading into the FGB) in 2003, noting the orbital velocity in mph and km/h.<ref name="trivia">{{Cite web |title=Space Station Science Picture of the Day: Speed Limit |url=https://spaceref.com/status-report/space-station-science-picture-of-the-day-speed-limit/ |access-date=2022-05-06 |website=www.spaceref.com}}</ref>

Prior to its launch aboard ''Endeavour'', conical [[Pressurized Mating Adapter]]s (PMAs) were attached to the aft and forward berthing mechanisms of ''Unity''. ''Unity'' and the two mating adapters together weighed about {{cvt|11600|kg}}. The adapters allow the docking systems used by the Space Shuttle and by Russian modules to attach to the node's hatches and berthing mechanisms.<ref name="NASA_unity"/> PMA-1 now permanently attaches ''Unity'' to ''Zarya'', while PMA-2 provided a Shuttle docking port. Attached to the exterior of PMA-1 are computers, or multiplexer-demultiplexers (MDMs), which provided early command and control of ''Unity''. ''Unity'' also is outfitted with an early communications system that allows data, voice and low data rate video with [[Christopher C. Kraft Jr. Mission Control Center|Mission Control Houston]], to supplement Russian communications systems during the early station assembly activities. PMA-3 was attached to ''Unity''{{'}}s nadir berthing mechanism by the crew of [[STS-92]].