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After a successful manual docking between China's Shenzhou-9 spacecraft and the space lab module Tiangong- 1, astronauts have begun to cross the Shenzhou orbit module and re-enter the space lab.
This is the same operation as when Shenzhou 9 automatically docked with the Tiangong-1 lab last Monday.
But now it may be a little easier, as the 3 astronauts have already spend several days in a gravity-free environment
