Image: Astronaut
John Raoux  /  AP
Astronauts of space shuttle Endeavour, from left, mission specialist's Bob Behnken, Nicholas Patrick, Steve Robinson, Kay Hire, commander George Zamka and pilot Terry Virts, arrive at the Kennedy Space Center in Cape Canaveral, Fla.
updated 2/3/2010 12:09:09 PM ET 2010-02-03T17:09:09

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.

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