Now that the Chinese have flown their Shenzhou spacecraft with crews of one, two and three astronauts, the next thing, as revealed on state TV last Chinese New Year, will be to hoist this space station module named Tiangong into orbit and have the next three Shenzhou missions dock with it. The Shenzhou spacecraft is built with an orbital module that can be left to fly in orbit independently, or maybe even serve as an add-on to Tiangong. If the orbital modules have been designed to join together in series Tiangong could become a mini alternative to the International Space Station. In less than a decade the Chinese will have progressed from Mercury to Mir.