On Fri, 12 Mar 2010 14:32:27 -0800 (PST), Frogwatch
wrote:

How could you make ISS "upgradable"? After all, it seems a shame to
de-orbit it just when it gets finished and it has yet to accomplish
anything.

Post-2020, replace the solar panels with solar dynamics for more
power/less drag/reduced need for batteries?

Brian