Most stories quote the NASA assertion, "The Soyuz relocation cleared the Pirs Docking Compartment, which doubles as an airlock, for spacewalks now scheduled for January and March." But haven't they already done an EVA from Pirs with the Soyuz in place on
Anybody know why the mean altitude has been decreasing somewhat rapidly in the past while? http://www.heavens-above.com/issorbitheight.asp Solar activity? Orientation?