ISS viewed from approaching shuttle
Astronauts completed their second spacewalk successfully. I had originally got it wrong evidently when I said the old ammonia tank had been stored in the shuttle cargo bay during the first spacewalk. That task was actually done during the second spacewalk, and the new ammonia tank installed. Engineers and astronauts have activated the new tank and it is performing well. After a few other tasks, the astronauts completed their EVA and returned inside the station.
The third and final spacewalk will be performed by Danny Olivas and Christer Fugelsang Saturday afternoon. Meanwhile, the rest of the crew is loading the empty Leonardo logistics module with items to be returned to Earth from ISS.