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UPDATED 5/27, 4:53 p.m. ET: Wednesday's launch was postponed until Saturday due to "unfavorable weather in the flight path."

The official call came with 17 minutes before launch.

See original story below. 
 

Ready your Angels & Airwaves megamix, as Wednesday marks the launch of SpaceX's historic astronaut launch in partnership with NASA.

The SpaceX Crew Dragon spacecraft is slated for liftoff on a SpaceX Falcon 9 rocket from Launch Complex 39A at NASA's Kennedy Space Center in Florida at 4:33 p.m. ET on Wednesday, with projected docking at the space station at 11:39 a.m. on Thursday. 

The mission will be the final test flight for NASA's Commercial Crew Program, a partnership aimed at developing and flying human space transport systems, as it seeks to gather crucial data on Falcon 9 rocket performance. Additional points of data collection interest include the Crew Dragon spacecraft and related ground systems, as well as docking and landing systems.

In a chat with CBS News this week, SpaceX founder Elon Musk said he was "the chief engineer" behind the mission that will carry NASA's Doug Hurley and Bob Behnken.

"So I'd just like to say if it goes right, it's credit to the SpaceX/NASA team," he said. "If it goes wrong, it's my fault."

As for the undeniable history being made, the Demo-2 mission marks the first time that a commercial aerospace company will carry humans into Earth's orbit, not to mention the fact that NASA itself hasn't sent astronauts up since 2011. At the time of this writing, NASA was still monitoring weather conditions at the launch site.

Up top, catch NASA's livestream of Wednesday's launch day festivities, which somehow do not include a performance by Angels & Airwaves. You can also watch the space-promoting proceedings on Twitter and via the NASA site: