UPDATE: Due to weather concerns, Baumgartner's jump has been delayed to Tuesday morning.

On Oct. 8, Felix Baumgartner will jump from a helium-filled balloon 120,000 feet above the ground, wearing nothing but a special suit. At least that's the plan. And as he plummets to Earth from the skies over Roswell, N.M., "Fearless Felix" hopes to become the first person to break the speed of sound in free fall.

How will it all turn out? No one--not even in the scientific community--knows for sure.

HuffPost Science will live-blog Baumgartner's historic jump, starting at 11:30 a.m. EDT on Monday, Oct. 8. We'll be streaming video and keeping you up to date on all things Felix.

"His blood could boil. His lungs could overinflate. The vessels in his brain could burst. His eyes could hemorrhage. And, yes, he could break his neck while jumping from a mind-boggling altitude of 23 miles," the Associated Press reported.

But Baumgartner, a 43-year-old former military parachutist from Austria, seems unperturbed by the gruesome possibilities.

"So many unknowns," Baumgartner said, "but we have solutions to survive."

The daredevil's pressurized suit and helmet will be critical in determining whether Baumgartner lives to boast about the daring leap. The ensemble is designed to protect him from the high altitudes and lack of oxgen he'll experience.

"As a physicist, I think the design of his suit is the most interesting part of his jump," Dr. Rebecca Thompson of the American Physical Society told The Huffington Post in an email:

It has to protect him through a huge range of temperatures and pressures. If it isn't pressurized correctly or has a leak, he would blow up like a marshmallow in a microwave because the pressure in the stratosphere is so small compared to the pressure pushing out from the inside of his body...

The suit will also need to protect him from the extreme force he will experience while falling. The suit needs to make sure that his blood flow continues uninterrupted which can be a problem when he is exposed to the types of forces expected on this jump.

Thompson called the protective suit a "triumph of technology."

Baumgartner says the stunt--which comes 65 years after Chuck Yeager broke the sound barrier flying a rocket plane--will serve as both a personal challenge and as an important scientific and medical experiment. On the Red Bull website (the energy drink is sponsoring the challenge), Baumgartner says, "[This] is an opportunity to gather information that could contribute to the development of life-saving measures for astronauts and pilots--and maybe for the space tourists of tomorrow. One of the unknowns is how a human body will react approaching supersonic speeds. The effects of the transition to supersonic velocity and back again are not known. This is just one of the things we hope to learn."

As for what to expect if he really does breaks the speed of sound? Says Thompson, "Honestly, I have no idea what will happen when he goes supersonic, but I really hope he does so I can find out."

For more on 'Fearless Felix' and his skydive from space, click through this slideshow:

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  • Felix Baumgartner's Supersonic Skydive Attempt

    Baumgartner

  • Felix Baumgartner's Supersonic Skydive Attempt

    Austrian skydiver Felix Baumgartner is scheduled to attempt the highest parachute jump of all time on Oct. 9, 2012. Here, Baumgartner performs during the first high altitude test jump from an airplane in Taft, California on February 20, 2012.

  • Felix Baumgartner's Supersonic Skydive Attempt

    Baumgartner during the high altitude test jump.

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    Baumgartner during a test jump from a helicopter, April 13, 2009.

  • Felix Baumgartner's Supersonic Skydive Attempt

    Baumgartner leaps off the 508-meter high Taipei 101 Tower in Taiwan on December 11, 2008.

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    Baumgartner at the top of the Christ the Redeemer Statue near Rio de Janeiro, Brazil on December 3, 2001. Before Stratos, Baumgartner was best known as a skydiver and BASE jumper.

  • Felix Baumgartner's Supersonic Skydive Attempt

    Baumgartner during the first manned test flight of the capsule, February 23, 2012.

  • Felix Baumgartner's Supersonic Skydive Attempt

    The mission control during the first manned test flight.

  • Felix Baumgartner's Supersonic Skydive Attempt

    The Roswell, New Mexico launch location of the first test flight.

  • Felix Baumgartner's Supersonic Skydive Attempt

    Baumgartner during the first test flight.

  • Felix Baumgartner's Supersonic Skydive Attempt

    The capsule just before the second manned test flight, July 25, 2012.

  • Felix Baumgartner's Supersonic Skydive Attempt

    The capsule in the pressure chamber at Brooks Air Force Base in San Antonio, Texas.

  • Felix Baumgartner's Supersonic Skydive Attempt

    The interior of the capsule in Lancaster, California on February 1, 2012.

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    Baumgartner during wind tunnel test on February 26, 2010.

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    Retired Air Force Colonel Joe Kittinger with Baumgartner during a press conference in Salzburg, Austria on April 23, 2012. Kittinger holds the record for the highest-altitude jump, which he set in 1960. He is an advisor for the Stratos project and will relay messages to and from Baumgartner during the October jump attempt.

  • Felix Baumgartner's Supersonic Skydive Attempt

    Kittinger just prior to his record setting jump from 102.800 feet in 1960. (U.S. Air Force Photo)

  • Felix Baumgartner's Supersonic Skydive Attempt

    Kittinger

  • Felix Baumgartner's Supersonic Skydive Attempt

    Baumgartner undergoes scientific tests in Los Angeles, USA on June 11, 2012.

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    Screen shows brain waves of Baumgartner during scientific test session.

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    Baumgartner during the first manned test flight.

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    Baumgartner inside the capsule prior to the second manned test flight.

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    Baumgartner during training session in Lancaster, California, on February 22, 2012.

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    Crew members prepare the capsule for the second manned test flight.

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    Crew members fill the balloon with helium before the second manned test flight.

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    Baumgartner steps out of the capsule during the second manned test flight.

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    Mission Coordinator Mike Jacobs (L) and Kittinger (R) work during the second manned test flight.

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