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(I went through this exercise for my own benefit, so I figured I'd post it)

Recently stay-extended astronaut Christina Hammock Koch posted this image to Facebook today and the object indicated by the red arrow caught my eye. It looked almost like a little version of the cupola, what is it?

enter image description here

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Using DOUG visualization software from NASA (available free here, restrictions may apply) I looked out the Cupola windows until I found this view from Window 5.

enter image description here

Then flying outside I can see that the object is not, in fact, a cupola, but an external spare mounted on the Russian MRM-1 module.

enter image description here

In fact, it's a maybe-to-be-used-later-but-probably-never radiator for the long-delayed Russian MPLM module.

It was brought up by Shuttle mission STS-132 as seen in this cropped version of NASA Photo iss023e044667.

enter image description here

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