STS-104   -   July 12th, 2001 To keep large, complex space stations such as the ISS in good working order requires a regular schedule of Extra-Vehicular Activities - or "Spacewalks" - by astronauts to replace and repair faulty components exposed to the harsh conditions of space. In the station's early years, it relied exclusively on visiting Space Shuttles to carry out these operations, using the shuttles' built-in airlocks as the point of egress and ingress for NASA spacewalkers. In o
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