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View of the micrometeoroid experiment.

Picture 3 of 4.

The hatch was modified to include this micrometeoroid experiment, although I have been unable to find any information regarding the experiment. The experiment included a small, circular portion on the hatch's exterior.

The smaller labels at upper right and lower left read

Outer Door
← Close | Open →

Vent Valve

Note the ID plate at the lower right of the experiment.