Fifth graders read about Earth's atmosphere today. We learned that it is 300 miles thick, but the troposphere, the layer that contains the air we breathe and that is closest to Earth, is only 11 miles thick. This video shows Felix Baumgartner's jump from a stratospheric balloon. He was more than 24 miles above the Earth's surface when he jumped. That's through the troposphere and into the stratosphere. This happened on October 14, 2012.