Spacewalk 2: Astronauts to head back outside

(AP) -- Space shuttle Discovery's astronauts have one last spacewalk to complete.

Stephen Bowen and Alvin Drew will venture back outside Wednesday morning to work on the International Space Station again.

They will vent ammonia out of the broken pump they relocated during Monday's' spacewalk. They also will install a camera, light and covers on outdoor equipment and remove some insulation.

Discovery will remain at the space station until Sunday. The shuttle astronauts are staying an extra day to help outfit the new storage room that was installed Tuesday.

This is Discovery's last trip to space. The shuttle will be retired once it returns to Earth next Tuesday and put in a museum.

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