There’s a second installment up of Keith Cowing and Frank Sietzen’s history of the decision to reformulate national space policy. It has additional detail on the plan, and indicates that the planned gap between Shuttle end and CEV operations is three years, not four (earliest lunar flight possibly in 2013), to be filled with Russian capability.

Here’s the part that I found interesting, and hasn’t been discussed much.

With a new focus on human exploration, the ISS will now be focused specifically on human physiology and factors needed to flight certify humans for long-duration space travel. Any research failing to contribute to this focus will be dropped from NASA’s space station research plan.

So-called microgravity science investigations into metallurgical and materials sciences will be dropped, as will overtly commercial and fundamental life science research that does not have a human life science linkage.

Other nations will likely continue their own research plans using their resource allocations on the ISS — but the U.S. portion will have a human exploration focus first and foremost. And even that will probably end by the middle of the next decade, with the station possibly taken over by the international partners, or perhaps a commercial concern.

The station has always had incompatible requirements (an inevitable result of the decision to have a single station) and this is one of them. Life sciences cause disturbances that interfere with good-quality microgravity, necessary for the materials research. This decision doesn’t make that problem go away–it just makes it the Europeans’ and Japanese’ problem. We’ll do our treadmill work and exercise, while they get exercised over the poor quality of their lab environment, until we pull out and hand it over to them.

But at least we’re starting to develop a sane policy toward station. Despite all the hype over the years, microgravity research has never panned out in accordance with the hoopla and promises. Perhaps there is still some potential there, but it will await a dedicated station that’s affordable to access on a timely basis. ISS never was that, and perhaps never will be.