Astronauts on the shuttle Atlantis's latest, and probably, last mission to the space station have made their first spacewalk.
Mission specialists Garrett Reisman and Steve Bowen ventured outside the platform to install an antenna and a robot tool tray.
Atlantis arrived at the station on Sunday following a picture perfect launch from Florida on Friday.
The ship's crew of six are spending the next week at the 350km-high outpost.
Other key tasks will include the replacement of six large batteries and the addition to the underside of the platform of a Russian docking and storage module.
The berthing on Tuesday of the Rassvet module to the Earth-facing port of the station's Zarya unit is likely to be the trickiest operation of the entire mission.
Cable niggle
The Atlantis crew were unable to do their usual full post-launch inspection of the orbiter's external surfaces on Saturday due to a snagged cable that prevented the ship's robotic arm from picking up a high-resolution laser imager and TV camera.
To compensate for some of the missing data, mission managers instead ordered more pictures than usual to be taken from the space station of the shuttle as it moved in for its docking.
Three station crew-members took a total of 398 photographs of Atlantis's heat-shield as the orbiter performed a back-flip. The pictures were then sent down to Earth for analysis.
The docking occurred at 1428 GMT, with the hatch opening and the movement of the Atlantis crew through into the International Space Station (ISS) taking place a little under two hours later.
"It's bigger than we remember and, speaking for myself, better than I remember," shuttle commander Ken "Hock" Ham was heard to say on the radio. "I love this place."
Atlantis is undertaking what many expect to be its last mission before retirement.
'Standby' role.
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