Space shuttle Atlantis made its final launch into space after an uncertain start Friday morning.
Heavy downpours and lightning threatened lift off at the Kennedy Space Center.
The mission marks Atlantis' 135th trip, and also its last trip to the International Space Station.
Debates over cost and the risk of human life finally put an end to America's space program.
Atlantis will carry 8,000 pounds of supplies to replenish the International Space Station.
It will be at least three years - possibly five or more - before astronauts launch again from U.S. soil.