Editing Spacelab (section)

===Habitable module===
<!-- [[File:SpacelabFCs.jpg|thumb|upright=1.0|right|Spacelab flight configurations]]-->
[[File:Spacelab Module in Cargo Bay.jpg|thumb|right|upright=1.0|Shuttle ''Columbia'' during [[STS-50]] with Spacelab Module LM1 and tunnel in its cargo bay]]

The habitable Spacelab laboratory module comprised a cylindrical environment in the rear of the Space Shuttle orbiter payload bay, connected to the orbiter crew compartment by a tunnel. The laboratory had an outer diameter of {{cvt|4.12|m}}, and each segment a length of {{cvt|2.7|m}}. The laboratory module consisted at minimum of a core segment, which could be used alone in a ''short module'' configuration. The ''long module'' configuration included an additional experiment segment.<ref name="NASA Historical Data Book">{{cite book |url=https://books.google.com/books?id=c39sVNPngJoC&pg=PA225 |title=NASA Historical Data Book |date=1988 |publisher=Scientific and Technical Information Division, [[NASA]] |page=225|isbn=9780160805011 }} {{Source-attribution}}</ref> It was also possible to operate Spacelab experiments from the orbiter's aft flight deck.<ref name="NASA Historical Data Book"/>

[[File:Crewmembers of STS-71, Mir-18 and Mir-19 Pose for Inflight Picture - GPN-2002-000061 rotated.jpg|thumb|right|upright=1.0|Ten people inside the Spacelab Module in June 1995, celebrating the docking of the Space Shuttle and [[Mir]]]]
The pressurized tunnel had its connection point at the orbiter's mid-deck.<ref name=Angelo2014>{{cite book |author=Joseph A. Angelo |title=Human Spaceflight |url=https://books.google.com/books?id=OGumSybNfFQC&pg=PA204 |year=2014 |publisher=Infobase Publishing |isbn=978-1-4381-0891-9 |page=204}}</ref> There were two different length tunnels depending on the location of the habitable module in the payload bay.<ref name=Angelo2014/> When the laboratory module was not used, but additional space was needed for support equipment, another structure called the ''Igloo'' could be used.<ref name=Angelo2014/>

[[File:Spacelab double module.jpg|thumb|upright=1.6|center|Spacelab long module configuration]]
Two laboratory modules were built, identified as LM1 and LM2. LM1 is on display at the [[Steven F. Udvar-Hazy Center]] at the [[National Air and Space Museum|Smithsonian Air and Space Museum]] behind the Space Shuttle ''Discovery''. LM2 was on display in the ''Bremenhalle'' exhibition in the [[Bremen Airport]] of [[Bremen (city)|Bremen]], Germany from 2000 to 2010. It resides in building 4c at the nearby [[Airbus Defence and Space]] plant since 2010 and can only be viewed during guided tours.