PREVIOUSLY: Space Shuttle Atlantis will blast off today on its last mission (STS-135) to the International Space Station.
The craft lifts off at 11:26 a.m. ET from Launch Pad 39A at Kennedy Space Center in Florida.
This launch marks not only the end of Atlantis's career, which began in 1985, but also the end of NASA's Space Shuttle program, which began in 1981 with the first launch of Shuttle Columbia.
As usual, NASA will provide a live feed of the launch. You can tune in to this historic event at NASA TV, or watch it right here (below).
Tune in before 11:26 ET to hear live commentary about the upcoming mission and to watch NASA's launch preparations. In the meantime, take a look back at the most iconic photos from the history of Space Shuttle Atlantis.