On Sat, 14 Jul 2012 09:30:41 -0700 (PDT), bob haller
wrote:



lets not forget that the stations modules have a finite lifetime. you
can replace all sorts of parts on a old car but that doesnt make it
new, and breakdowns on old vehicles are to be expected.

So do B-52s, KC-135s, T-38s and P-3s, all of which are still in active
military service over 50 years after they were delivered.

if the modules could be returned to earth and completely refurbished
this is true.

It is true regardless.

in the case of military jets only the airframes havent
been changed. all other parts have perodically upgraded or totally
replaced.....

The airframes are likewise the only part of ISS modules that can't be
changed. Pretty much everything else can be changed out. It was
designed that way deliberately, Bob.

Brian