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Because the pressure lightens as you get up. there isn't a lot of oxygen. and the air is very thin. >> the pressure of the helium inside the balloon is now much greater than the surrounding air pressure. so it continues to expand until finally the balloon pops and the craft comes plummeting back to earth at more than 100 miles an hour. >> so the parachute deploys maybe 30 seconds after the balloon bursts. it doesn't do anything until it gets to heavier air. >> at one point, it rocked head over heels. even though it didn't have head or heels. it was just like that. it was pretty amazing because...

A little craft below it. >> it got like that big. because the pressure lightens as you get up. there isn't a lot of oxygen. and the air is very thin. >> the pressure of the helium greater than the surrounding air pressure. so it continues to expand until finally the balloon pops and the craft comes plummeting back to earth at more than 100 miles an hour. >> so the parachute deploys maybe 30 seconds after the balloon bursts. it doesn't do anything until it gets to heavier air. >> at one point, it rocked head over heels. even though it didn't have head or heels. it was just like that. it was pre...

It was about 22 feet in diameter. it's enormous. a the little craft below it. >> it got like that big. because the pressure lightens as you get up. there isn't a lot of oxygen. and the air is very thin. >> the pressure of the helium inside the balloon is now much greater than the surrounding air pressure. so it continues to expand until finally the balloon pops and the craft comes plummeting back to earth at more than 100 miles an hour. >> so the parachute deploys maybe 30 seconds after the balloon bursts. it doesn't do anything until it gets to heavier air. >> at one point, it rocked head ove...

Nearly 19 miles above the earth on its 95-minute voyage. >> at the very end, the balloon is stretched to its absolute maximum capacity. it was about 22 feet in diameter. it's enormous. a little craft below it. >> it got like that big. because the pressure lightens as you get up. there isn't a lot of oxygen. and the air is very thin. >> the pressure of the helium inside the balloon is now much greater than the surrounding air pressure. so it continues to expand until finally the balloon pops and the craft comes plummeting back to earth at more than 100 miles an hour. >> so the parachute deploys...

A little craft below it. >> it got like that big. because the pressure lightens as you get up. there isn't a lot of oxygen. and the air is very thin. >> the pressure of the helium inside the balloon is now much greater than the surrounding air pressure. so it continues to expand until finally the balloon pops and the craft comes plummeting back to earth at more than 100 miles an hour. >> so the parachute deploys maybe 30 seconds after the balloon bursts. it doesn't do anything until it gets to heavier air. >> at one point, it rocked head over heels. even though it didn't have head or heels. it...