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Astronauts of space shuttle Endeavour arrive at the Kennedy Space Center in Cape Canaveral, Fla., Tuesday, Feb. 2, 2010, to prepare for their upcoming launch. (AP Photo/John Raoux)

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Weather looking good for shuttle launch

Launch time is 4:39 a.m. on Sunday

Updated: Wednesday, 03 Feb 2010, 11:10 AM EST
Published : Wednesday, 03 Feb 2010, 11:10 AM EST

MARCIA DUNN,AP Aerospace Writer

CAPE CANAVERAL, Fla. (AP) - NASA is predicting good weather for this weekend's space shuttle launch.

Endeavour is scheduled to blast off Sunday morning on the last major construction mission at the International Space Station. A new space station room is loaded aboard the shuttle, as well as a cupola with seven windows.

NASA officials said Wednesday everything is going well and that the countdown will begin on time early Thursday. There's a 70 percent chance of acceptable weather.

The six astronauts arrived at their Florida launching site late Tuesday. Commander George Zamka welcomed everyone to the night shift. He noted, "It's the only shift we've got."

Launch time is 4:39 a.m. All three spacewalks also will take place in the wee hours.