关于这张图
S133-E-007808 (1 March 2011) --- In the grasp of the International Space Station’s Canadarm2, the Italian-built Permanent Multipurpose Module (PMM) is transferred from space shuttle Discovery’s payload bay to be permanently attached to the Earth-facing port of the station’s Unity node. Earth’s horizon and the blackness of space provide the backdrop for the scene. Photo credit: NASA or National Aeronautics and Space Administration
