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Detail of an ambient helium sphere the S-IVB's thrust structure.

This photo dates to late 2005. Note the LH₂ chilldown pump line coming from inside the aft skirt at the upper left the photo and the cylindrical hydraulic system accumulator-reservoir at the lower right. Prior to Barack Obama cancelling the Constellation Program, MSFC engineers removed some components from this S-IVB stage for study. These appear to have been among the components removed, as my photos from 2006 show that these components had been removed.