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Florida: Astronauts on the international space station faced the longest and hardest spacewalk of their mission on Saturday.
The mission involves a more than seven-hour spacewalk to wrap up repair work.
At a news conference Friday, astronaut Heidemarie Stefanyshyn-Piper said her upcoming spacewalk would be busier than usual.
She and Steven Bowen have to finish cleaning and lubricating a jammed solar wing-rotating joint, and put in new bearings.
"It looks like it's going to be challenging," she said. "We have a lot of work to do."
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