It’s one of those events that captures the imagination. Felix Baumgartner took a helium-filled balloon 24 miles up, into the Earth’s stratosphere, and jumped. On the way down he started tumbling, but he corrected his position before it got out of control and ended up hitting Mach 1.24, or 833.9 mph (according to preliminary data). Such a speed made him the first human to break the sound barrier without a jet or rocket-propelled spacecraft.
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