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I saw one burn up in the atmosphere once. It was quite spectacular ─ the flames were green! :)

Hmmm, you say that, but when you are observing them from here on the surface of Planet Earth, then you are a long way from up there beyond the borders of space. :) A satellite could be maneuvering...

Those are the satellites that SpaceX launched recently. :)

Well, all helicopters are dual-rotor, but usually the tail rotor is placed vertically, and on some helicopters, the main motor has two counter-rotating rotors. But the Chinook and others like it...

Not at that altitude, no. ;)

Let me see if I can pull some of my magic and embed the pictures here for you. :)



http://projectavalon.net/forum4/attachment.php?attachmentid=39582&d=1543626845

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