GEORGE DILLER: T minus ten, nine, eight, seven, six,
go for main engine start, four, three, two, one, zero and liftoff of Space Shuttle Endeavour,
expanding the International Space Station while creating a classroom in space.
ROB NAVIAS: Houston now controlling the flight of Endeavour.
The space shuttle begins its journey back into orbit.
Endeavour rolling onto the proper alignment, heads down,
wings level for the eight-and-a-half-minute ride to orbit,
taking aim on the International Space Station for docking on Friday.