INTERNATIONAL SPACE STATION -- The first spacewalk is in the books for the crew of space shuttle Endeavour.
Astronauts Heidemarie Stefanyshyn-Piper and Stephen Bowen left the ISS just before 1:30 p.m. Tuesday, and stored an empty nitrogen tank inside Endeavour's cargo bay so it can be brought back to Earth.
Despite losing a tool bag, the astronauts then replaced two sets of bearing assemblies on a damaged joint that rotates the starboard solar wings on the ISS.
The astronauts cleaned the area around a third bearing assembly, which will be replaced on the next spacewalk.
Meanwhile, it looks like the crew lost a spider.
Two of the creatures were taken up on Endeavour as part of a push for teachers across the country to get their students involved with science.
Right now, the astronauts can only see one of the arachnids.
The crew isn't too concerned, saying they think the other spider will likely turn up soon.
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