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Answer to lack of sound, wind. Even if there is apparently no wind on the ground there may be a significant breeze even a few hundred feet up. This can often cause any rotor or engine noise to be blown away from the observer making it appear almost silent. Further you haven't really told us anything about the helicopter at all. What shape was it? Did it have a twin or single rotor? How far away was it? What approximate altitude was it? How did you gauge it was "massive"? Was it actually black or a dark shade or just appeared black in silhouette. Why does this seem out of the ordinary to you?
i saw a massive black helicopter. I didn't notice till it passed that it made no noise except for a few seconds after it had passed me...., ....and hear helicopters all the time, they are only a fraction of the size of this massive one making almost no sound at all...
Common and familiar but always spectacular. Almost certainly one of two things, either an asteroid rich in copper, or a defunct satellite re-entering the atmosphere.
I also have had the pleasure of seeing a green fireball at around 11pm while standing outside...
All things entering/re-entering the atmosphere move quick, especially meteor's, so getting a picture is admittedly very difficult. Further you need to have the camera set up to take night shots and that requires a tripod, a slow/open shutter speed, aperture as wide as you can go, and a fast ISO. However you did see a "shooting star" thats the colloquial name for a meteor sighting. As I said above the green colour is not unusual at all.
The green fireball i went by fairly quick, and would not have been able to take a picture, at the time I didn't even know what one was. I thought I had seen a shooting star, I've seen tuns, but had ever seen one green like that...
I think you meant to say internet but no matter. As for it being likely military activity, pure rubbish fantasy by someone leading you astray. Exactly why would it have likely been military activity? Did the person who wrote what you read provide an excuse for it, or did you just believe it without questioning it? Better still just post the links here so all the member's can have a look. You have to realise that there are a lot of nut cases on the web who write fantasy and lies in order to make people either believe there delusions or try and gain friends or respect that they think they dont get in the real world.
I went to look it up on the interwebs, and found out it was more likely that it was military activity....