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When an object passes through the air, it creates a series of pressure waves in front of it and behind it, similar to the bow and stern waves created by a boat. These waves travel at the speed of sound, and as the speed of the object increases, the waves are forced together, or compressed, because they cannot "get out of the way" of each other, eventually merging into a single shock wave at the speed of sound. This critical speed is known as Mach 1 and is approximately 1,225 kilometers per hour (761 mph) at sea level at room temperature. In smooth flight, the shock wave starts at the nose of the aircraft and ends at the tail. Because directions around the aircraft's direction of travel are equivalent, the shock forms a Mach cone with the aircraft at its tip.
perhaps these craft wheren't 'traveling' as we know it. Just maybe, they're 'surfing' a time-space wave that, depending upon the craft's location on the wave [peak vs. trough], they could actually 'eliminate' any and all turbulance [aquatic, atmospheric, or otherwise] by simply not being there when we observe them.
Originally posted by Signals
reply to post by Kandinsky
Could it be that what you saw was in space and not in the atmosphere?
Originally posted by UberL33t
If Alien craft were able to manipulate space-time in the same way they wouldn't actually be moving fast enough to create a sonic boom, however to the observers on the ground the UFO would appear to move at unimaginable speeds. So in essence, their speed doesn't actually fluctuate, just their position in time.