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Overall view of the aft end of the S-IVB, including the J-2 engine, ambient helium spheres, and O₂H₂ burner (aka "helium heater").

Picture 2 of 2.

I last visited KSC before I knew what a O₂H₂ burner was, and so I have no more detailed photos of it on this S-IVB stage, but see the pictures of the helium heater in my Johnson Space Center S-IVB picture set.