Overall walk-around of the Service Propulsion System (SPS) engine.
Picture 2 of 6.
At the very center is the engine's injector (more detailed photos of the
engine's injector start at dsc08242.jpg).
The remaining rust-colored section is the SPS engine proper (which, based on
its color, appears to have never been fired). The inner silver and darker
grey-colored sections are the columbium section of the nozzle extension, while
the lighter grey section is the portion of the nozzle extension which is made
of titanium.
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