The two space station crews, along with the four Discovery astronauts, continued unloading supplies from the Italian-built Leonardo cargo module, a shiny giant cylinder that the shuttle crew attached to the space station on Monday.

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The two space station crews, along with the four Discovery astronauts, have finished unloading supplies from the Italian-built Leonardo cargo module, a shiny giant cylinder that the shuttle crew attached to the space station on Monday.

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Discovery's payload bay is taken up with the Italian-built Multi-Purpose Logistics Module (MPLM), which acts as a giant packing box on shuttle logistics missions.

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"This is the time when we have to say goodbye to our friends, our colleagues, the excellent crew of shuttle Atlantis that did an excellent job performing three EVAs, installing the new Russian module, having good fun, enjoying living on the station and working in space, " the ISS Expedition 23 commander Oleg Kotov told Ken Ham, who leads the Atlantis crew.

BBC: Atlantis set for 'final' return