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Scientists once thought the 'sound barrier' could not be crossed. What was it really?

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  1. A solid wall of air
  2. A rise in drag near the speed of sound
  3. A layer of the atmosphere

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References

  1. Mach Number, NASA Glenn Beginner's Guide to Aeronautics www.grc.nasa.gov/www/k-12/airplane/mach.html Checked 2026-10-10.

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