NASA officially cleared Space Shuttle Discovery for launch today. This announcement “followed two delays to resolve technical issues for the flight, which would be the 39th and final voyage for NASA’s most-flown shuttle.” In related news, continue reading to watch a video on the space station celebrating decades of use.

The shuttle is now targeted for launch at 3:29 p.m. EDT, though the weather may be another showstopper. Meteorologists forecast an 80 percent chance of another delay due to rain and clouds in the area around the Kennedy Space Center in Florida at the time of launch.

[via Reuters]