Their data showed that the speed of part of the condensate exceeded the speed of sound, and they had therefore made an acoustic event horizon.
They took photographs and used them to calculate both the speed of flow and the speed of sound within the condensate.
As a consequence, the D8.1 would cruise at Mach 0.72 (seven-tenths of the speed of sound) and the D8.5 at Mach 0.74, compared with about Mach 0.79 for a B737-800.
The nylon parachute 70 feet in diameter will slow the craft to just under the speed of sound.
The X-51A WaveRider flew for more than three minutes under power from its exotic scramjet engine and hit a speed of Mach 5.1, or more than five times the speed of sound.
Austrian Felix Baumgartner became the first skydiver to go faster than the speed of sound.
If tests go as planned, it will be the first plane ever to fly faster than the speed of sound on a fuel mix that is half biomass.
For the few who don't know, Yeager's the first human to fly above Mach 1, the speed of sound.
It can fly at up to 2.5 times the speed of sound and is designed for low-altitude, high-speed, precision attacks.
NASA, America's space agency, is paying for an experimental version of Inductrack that will travel at half the speed of sound.
The five-metre-long missiles are supersonic within moments of leaving the launcher, having taken their initial course from the control computer, and accelerate to five times the speed of sound.
Once the light enters the ruby, its speed is slowed down to around the speed of sound (approximately 741mph) and the spinning motion of the rod drags the light with it, resulting in the image being rotated by almost five degrees: large enough to see with the naked eye.
Before being chosen in 1962 as one of the "Group II" astronauts -- which included Apollo 13 commander James Lovell along with such legends as Frank Borman, Pete Conrad and John Young -- Armstrong was one of the elite pilots selected to fly the X-15 rocket plane up to five times the speed of sound and toward the edge of space.
The reality is that business is expected to move nearly at the speed of sound to meet earnings expectations each quarter.
Though the WaveRider was designed to reach Mach 6, or six times the speed of sound, program officials were satisfied with its performance in the latest test.
Some navies are already testing rail guns, which use huge amounts of electricity to produce a magnetic field which then accelerates projectiles to many times the speed of sound.
To cover that retreat, the company trumpeted its Sonic Cruiser, a futuristic 250-seater jet that would fly close to the speed of sound and clip hours off long-haul flights.
Imagine 33 large pick-up trucks hurling towards you at five times the speed of sound.
Meanwhile, Boeing's Sonic Cruiser (a futuristic aircraft designed to fly at almost the speed of sound) has not been well received by airlines.
It was only a short burn lasting about 16 seconds, but it propelled SS2 beyond the sound barrier to a speed of Mach 1.2.
Any plane that flies past the speed of sound creates a sonic boom, which often results in a major noise disturbance over close-by areas.
Its top speed would be 0.8 Mach that is, 0.8 times the speed of sound or around 600 miles per hour, slightly slower than the coming generation of airliners.
Felix Baumgartner plans to leap from 23 miles above Earth on Sunday, breaking the speed of sound within 40 seconds before free falling for another five minutes or so.
But they have not been widely adopted because they have to be accelerated to Mach 1 (the speed of sound) before the air inside them becomes compressed enough for them to work.
Just last week, our Air Force -- our own Air Force -- used an advanced biofuel blend to fly a Raptor 22 -- an F-22 Raptor faster than the speed of sound.
Viewing the Atlantis orbiter perched on the launch pad and protected by the service structure made it seem very fragile, even though it was made to travel over 100 times the speed of sound.
Work at the speed of sound instead.
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And a red-faced Boeing was forced to withdraw its Sonic Cruiser, a plane intended to fly at near the speed of sound, after airlines rejected the idea that passengers would pay a hefty premium for such rapid transit.
These waves travel at the speed of sound, but when a jet travels at Mach 1 and above these waves merge into one single shock wave as they cannot get out of the way of each other quickly enough.
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