We could be less than a year away from the launch of Tiangong-1, China's first space laboratory. We've been expecting this launch for years, but relatively little is still known about this mission. We have grown used to seeing computer-generated artwork of this small, stubby laboratory module, not much larger than the Shenzhou crew-carrying spacecraft that will dock with it. China Central Television has also broadcast short video clips showing the module undergoing assembly, and periodically, a short news report on the mission pops up in the Chinese media. Beyond this, not much is really known about Tiangong. We don't...