Keck engineer Mike Dahler works inside the upper shutter to replace a wire rope
Keck engineer Mike Dahler works inside the upper shutter to replace a wire rope
Mike Dahler in the upper shutter
When you want to see the stars, find someplace dark
Keck engineer Mike Dahler works inside the upper shutter to replace a wire rope
Keck engineer Mike Dahler works inside the upper shutter to replace a wire rope