posted on Aug, 21 2003 @ 05:34 PM
Everything val says about Columbia is correct...
Columbia (OV-101) was overbuilt. It was structurally different than Atlantis, Discovery, and Endeavour. Columbia belongs more along a 'development
curve' that includes Enterprise (OV-100), and Challenger (OV-99). Originally, Enterprise was to be the first shuttle, but was found to be too heavy
and so was relegated to atmospheric tests. The bare frame that would become Challenger, which was built for vibrational testing, was then modified to
fill-out the shuttle fleet. With Atlantis and Discovery, NASA had, more or less, its first 'production block' of standardised shuttles. After the
loss of Challenger, Endeavour was assembled from spare parts and static test components along the specs of Atlantis and Discovery.
Columbia, like val said, had no docking capability at the time of the disaster.
The ISS, though, has not received any new modules in months, since before the Columbia accident. Its construction, therefore, is seriously behind