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Looking down at the largest clean room on the east coast.

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An operational mockup of part of the Hubble Space Telescope.

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A model of the HST in the lobby of the building that houses the clean room.

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Looking out over the shipping pallets and wiring harnesses.

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The innermost of three layers of HEPA filters four stories high. Air is forced through the room and these filters with such force that they don't have any locks on the doors, the air pressure is sufficient to keep a truck from moving one of the massive doors.

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A full-sized mockup of the power buss of the HST used to train astronauts.

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The thing is, this unit was never designed to be replacable. They've replaced it once already.

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The fuse panels, clearly showing the sockets for the fuses.

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Each fuse has a unique pinout, so that it isn't possible to screw the wrong fuse into place during maintenance.