Spacewalking day for astronauts at space station

Two of space shuttle Discovery's visiting crew will float outside late Monday morning. They will spend all afternoon moving a broken ammonia pump to a better location, installing an extension cable and doing other chores.

One of the astronauts going out is Stephen Bowen, who was assigned to the job just last month. The original lead spacewalker, Timothy Kopra, was injured in a bicycle accident and pulled off the flight. Kopra will help direct the spacewalk from Mission Control. He's still on crutches.

This is the last flight for Discovery. After it returns to Earth next week, it will be retired and sent to the Smithsonian Institution. Only two other shuttle missions remain.

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