CasualBystander
Celestial
No sound. Not even a breeze.
It was after midnight, in residential part of the city, the trees are very tall (spruce & pine) because they are quite old. The reason I mention the trees is because it looked to me as if it were no more than 100 feet above tree level. It then floated silently up and into the only cloud that was nearby. The cloud lit up the same color as the amber/yellow signal you see at the traffic lights. There were at least 15-20 other people standing there watching it. It was in July of 2ooo. Not a word was mentioned in any news papers or TV/radio broadcast news networks. I know because I checked thoroughly for the following 2 days.
That's interesting. Were you less than a mile away?
If you have ever watched a fighter (like an F16) take off you know how loud jets are.
Not sure how exhaust noise could be baffled effectively. If compressor/turbine stages are used that whine is hard eliminate.
With rockets the turbulence in the boundary between the exhaust and the surrounding air makes the noise, and a Mach 8 exhaust stream produces a lot of turbulence which makes a lot of noise.
Your information would argue for an unconventional propulsion system.