UFOs are aways silent, outside. UFOs don't have noisy jet engines. How quiet are they inside? In atmosphere, do occupants hear wind sounds from air on the hull? Or are they in a 'bubble' that excludes air? If they exceed the speed of sound often, they would normally hear or feel the effect, But I suspect the occupants are shielded from that. Electrogravitic propulsion probably comes from rotating machinery, but it should inherently not be noisy with random noise. Perhaps any sounds inside a craft are more from rotation in machines with its periodic kind of sound. That would be heard as a tone with some repetitive waveshape. It could be a hum or a drone but not a shrill or jarring noise, because that would be hard on crews if they have ears. We are going to assume that aliens do have both sight and hearing, and maybe other senses. Energy sources might be nuclear or free energy, but not internal combustion nor jet engines. A UFO probably sounds like a submarine inside.
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I was part of the mass event in Indy, late 80's. Saw the Big ship and later quite a few smaller ones.
Saw one 'jump' about a mile or so. Like a blip of movement. One ended up over the car, probably not more than 20 feet above us. It was gliding on the atmosphere like a slow moving jetski. Had a rectangular metallic appearance, edged corners and some small prop on the back. Made a slow oscillating sound maybe 100bpm. Low humm noise that rose and fell on a regular basis. No downdraft.
EDIT: we were on a quiet overlook. Mid evening about sunset. I'd say it was about as loud as a microwave standing next to it.
I'm assuming there's a fuck ton of aliens out there after even a casual review of mankinds history with this phenomena. I expect there's a lot of different technology.
they are not physical or of this realm.
Possibly, in the sense that they may be metaphysical phenomena. I interpret metaphysical merely as meaning not of the normal physical 3D spacetime realm we can know. If there are higher dimensions that we cannot perceive directly, some of these could be of that nature.
I'm guessing you'd hear a lot of Deutch
I admit that is a possibility. We may be in for some surprises if it turns out the Nazi Bell technology was real and that they continued developing it in a purported polar base.
However, it could also be that the greys like Sauerbraten.
There can be sound dampeners that also absorb and convert sound energy. If there is technology advanced enough to travel across the galaxy, then there is probably technology to make the most use of energy in the ship.
Source?
Merely every news story since 1950, globally, including military reports.
You've seen every fucking news story about UFOs?
Did you need help translating those fucking news stories from India, Japan, China or Iran?
I've very likely read many more than you have. I've read news on the topic for 25 years. And you?