First actual shot of alien life observing earth?
I cannot imagine a computer-based digital defect having that fine form. When I've had corruption of a card or just an image file, the corrupted area doesn't come through.
Looking very closely, it seems like very fine wires or cables running down to the 3D appearing gothic archways, for lack of a better way to describe it.
Another wild shot, if you don't like "alien spacecraft with failing invisibility cloak," I notice you're shooting directly at the sun in this shot. Is there any way this could be a fine net of cement at the very edge of your lens being revealed by the intensity of the sun causing some type of intra-optic reflection? Or a projection of a pattern of some type off the large black object?
My favorite answer was "fly wing" but after looking more closely, it doesn't seem like that either.
I know those are far-out ideas....
Are you sure there was no helicopter lifting bridge parts?
Look at how most of the arch work is black, but some sides glitter silvery in the sun.
I blew it up really large on my screen... and ... I'm stumped.
If this were closer to April Fools...