UPDATE: Missed the launch? You can watch a recap here.
PREVIOUSLY: After a delay caused by mechanical difficulties, space shuttle Endeavour is set to blast off for its final mission (STS-134) on Monday, May 16.
The craft will launch at 8:56 a.m. ET from Launch Pad 39A of the Kennedy Space Center.
This will be the 25th and final liftoff for Endeavour, and the second-to-last shuttle launch ever.
In June, Space Shuttle Atlantis is set to take off for STS-135, the final shuttle mission.
Endeavour's previous lunch attempt on April 29 drew a massive crowd of close to 700,000. This time, 500,000 are expected to attend, with wounded Arizona Representative Gabrielle Giffords among them. Giffords's husband, Mark Kelly, is the STS-134 mission commander.
You can watch the shuttle launch online NASA TV, or see the live stream below.