"Fearless Felix" approaches speed of sound in second Red Bull Stratos jump: "Skydiver "Fearless Felix" Baumgartner has done it again - successfully carrying out an 18.3 mile (29.5 km) skydive from the Red Bull Stratos balloon high above Roswell, NM. His top speed was 536 mph (865 km/h). At that altitude, the speed of sound is about 673 mph (1083 km/h), so Baumgartner's top speed was Mach 0.80!"
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