One bad moment occurred out of camera range during Dr. Massimino's first spacewalk of the mission.
The maneuver took about 25 minutes of the spacewalk of 6 hours and 10 minutes.
The third spacewalk of the mission, which will complete Dextre, is scheduled for Monday.
The image, tweeted by fellow ISS-dweller Terry Virts, shows Butch Wilmore floating in space as he took part on the third spacewalk of the week.
The radiator will deploy upon commands sent from the ground before the third and last spacewalk of the mission, scheduled for Monday.
Managers had decided to devote the next spacewalk of the Discovery mission, scheduled for Thursday, to examining the right-hand joint.
Canada's government websites use doctored photographs of its contribution to the International Space Station to call special attention to itself.In the image above, America's Stephen Robinson is on the third spacewalk of space shuttle mission STS-114 in 2005.
Astronauts on the first spacewalk of the shuttle Discovery's mission to the International Space Station freed a new Japanese-made laboratory from its moorings in the shuttle payload bay on Tuesday so that it could be removed.
Col. Rex J. Walheim of the Air Force, who conducted the first spacewalk of the mission on Monday, was joined by Hans Schlegel, a European Space Agency astronaut from Germany.
During the last spacewalk of the current shuttle mission, Garrett Reisman, an astronaut from Parsippany, N.J., and one of the few Jewish astronauts, complimented Michael Foreman on his camera work: Listen to the clip here in Quicktime.
Heidemarie Stefanyshyn-Piper of the Navy, an astronaut on a mission to the station, was on the first spacewalk of the mission, which involves cleaning and greasing a balky rotary joint, when she discovered that a grease gun had erupted inside its tote bag.
