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Space shuttle Endeavour nears the end of it's six hour journey from the Vehicle Assembly Building to launch pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Wednesday, Jan. 6, 2010. (AP Photo/John Raoux)

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Updated: Thursday, 04 Feb 2010, 11:10 AM EST
Published : Thursday, 04 Feb 2010, 11:10 AM EST

MARCIA DUNN,AP Aerospace Writer

CAPE CANAVERAL, Fla. (AP) - NASA is counting down toward Sunday's launch of space shuttle Endeavour.

The countdown clocks began ticking early Thursday.

Endeavour and a crew of six are all set to deliver a new room to the International Space Station. They're also taking up a dome with seven windows that will serve as an unprecedented lookout.

Forecasters put the odds of good weather at 70 percent. Launch time is 4:39 a.m.

The astronauts will be working the graveyard shift during the 13-day mission. Everything — all three spacewalks, and the docking and undocking of the shuttle — will take place late at night or in the wee hours.

This will be the last major construction mission at the space station, which is almost complete.