If all goes according to plan, Felix Baumgartner will plummet to Earth from an altitude of 120,000 feet (36,576 meters) this morning, becoming the first skydiver to break the sound barrier during his 5.5-minute freefall.
He should also notch a few other records in the process, including longest-duration freefall and highest manned balloon flight, say officials with his mission, which is called Red Bull Stratos.
You can watch the 43-year-old daredevil's record-breaking plunge live here at SPACE.com.
The action should begin in earnest around dawn New Mexico time, when Red Bull Stratos' 55-story balloon is slated to lift off from Roswell. Over the course of about three hours, the balloon will lift Baumgartner - riding in a custom-built 2,900-pound (1,315 kilograms) capsule - up to the desired altitude.
Clad in a special pressurized suit, Baumgartner will then step out into the void, enduring unprecedented speeds as he hurtles through the stratosphere in freefall. He should deploy his parachute at an altitude of about 5,000 feet (1,500 m), then float safely to the desert floor.
The daredevil is aiming to break a skydiving mark that has stood since U.S. Air Force Capt. Joe Kittinger leapt from 102,800 feet (31,333 m) back in 1960. Kittinger serves as an adviser to Baumgartner's mission.
Baumgartner's supersonic leap was originally scheduled for Monday (Oct. 8), but it was postponed because of weather concerns. Team officials were worried that winds at liftoff time might exceed the mission's 2 mph (3.2 kph) threshold, which is in place to ensure that the enormous but fragile balloon isn't damaged.
Baumgartner has been working up to Tuesday's leap in a stepwise fashion. He jumped from 71,581 feet (21,818 m) this past March and then dove from 97,146 feet (29,610 m) on July 25.
Red Bull Stratos officials have referred to today's attempt as a jump from the edge of space, but this is perhaps a bit of an exaggeration. Space is generally considered to begin at an altitude of 62 miles (100 kilometers), or about 327,000 feet (though the U.S. Air Force awards astronaut wings to pilots who fly above 50 miles, or 80.5 km).
Follow SPACE.com senior writer Mike Wall on Twitter @michaeldwall or SPACE.com @Spacedotcom. We're also on Facebook and Google+.
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