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SHOTLIST Space 1. Various of astronauts on exterior of international space station (ISS), view from helmet-cam Houston, US 2. Wide of mission control Space 3. View from helmet-cam as astronaut moves along rails on exterior of ISS 4. Various of ISS, spacewalk Space 5. Astronaut using tool to work on ISS 6. Wide of astronaut during spacewalk 7. Close up of astronaut working on piece of equipment 8. Close up of astronaut using tool 9. Wide of astronaut working on side of ISS, with the failed gyroscope that was recently replaced visible in bottom of picture STORYLINE Astronauts aboard the shuttle Endeavour and the international space station on Saturday performed the last spacewalk of their joint mission, an outing that was scaled back because of approaching Hurricane Dean. NASA shortened the spacewalk by two hours so Endeavour could return to Earth on Tuesday, a day early, if the storm appeared to threaten the Houston home of Mission Control. Spacewalkers Dave Williams and Clay Anderson installed a shuttle inspection boom stand on the station, then turned their attention toward securing an antenna mount and retrieving two experiments from outside the station. The rest of the original itinerary involved several space station chores that could be done later. Midway through the spacewalk, a fire alarm went off inside the station, but the astronauts inside neither saw nor smelled smoke and Mission Control determined it was a false alarm. The interruption did not affect the work outside. The two astronauts were being extra careful about avoiding any sharp edges so they wouldn't rip a glove and have to rush back inside. They also frequently checked their gloves for damage. The mission's third spacewalk was cut short on Wednesday when astronaut Rick Mastracchio noticed he'd pierced the thumb of his left glove. The slit penetrated only the top two layers of his five-layer glove. Hurricane Dean is currently heading toward Mexico's Yucatan Peninsula. If it looks like the storm might veer toward Houston, Mission Control could be forced to relocate to the Kennedy Space Centre in Florida. Operations at Cape Canaveral would not be as good and there would be fewer controllers, which is why NASA was leaning toward bringing the shuttle home a day early. Endeavour's original flight plan called for it to undock from the station on Monday and land on Wednesday. Documents that Mission Control sent to the crew early on Saturday said they would undock on Sunday and landing was being planned for Tuesday. But NASA officials said a final decision would be made later in the day, after mission managers analysed the most recent forecasts. Shuttle managers also decided on Friday to put off fuel-tank preparations for the next launch until engineers decide how to best solve the latest foam-loss problem. A piece of foam, ice or a combination of both broke off the tank during Endeavour's launch last week and shot into the shuttle's belly, carving out a deep gouge that triggered a week of furious thermal analyses. The concern was not that Endeavour might be destroyed like Columbia was in 2003, but rather that heat exposure during re-entry might weaken the aluminium frame and require lengthy post-flight repairs. Mission managers decided on Thursday that the damage wasn't bad enough to assign astronauts the risky task of repairing the gash during Saturday's spacewalk. Foam has come off that same part of the tank, a bracket that holds the liquid oxygen feed line in place, on previous flights. LeRoy Cain, a ranking member of the mission management team, said the redesign to the area in question probably will not delay the next mission, currently targeted for October. But it could well postpone some of the flights after that, he said. You can license this story through AP Archive: http://www.aparchive.com/metadata/youtube/19ae07f38bf5a70b1e5d8962d5dd6ee3 Find out more about AP Archive: http://www.aparchive.com/HowWeWork