Next month, a new Russian docking module will become the latest addition to Alpha.

CNN: Spacewalkers hang experiments on Alpha

The three will return to the spacecraft again and separate the module for the manual docking to be performed by Liu Wang.

FORBES: China Astronauts Prepare For Historic Weekend Mission

The astronauts are aiming to complete China's first manned docking with the Tiangong-1 module already in orbit, an important first step towards China's aim of creating a working space station by 2020.

BBC: China's female astronaut quandary