The countdown to the first shuttle launch in 2007 began Tuesday at 9 p.m. EDT.
The 7:38 p.m. EDT Friday window is NASA's first opportunity to launch space shuttle Atlantis. There is a 70 percent change the weather will cooperate.
The shuttle will conduct an 11-day mission carrying seven astronauts. Its primary objective is to deliver a third pair of solar wings, which help power the international space station. Three spacewalks are also planned to continue construction of the orbiting outpost.
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