might be a number of ways of creating lights or images in the sky. perhaps something like haarp.  the sky has various colors because the gases are ionized. and plasma is created, like in florescent lights, by the various gases being ionized by an electromagnetic field. and this may be possible remotely from some sort of array of antennae or emitters. or by some sort of craft that has a coating that is able to emit an electromagnetic field without frying its own components. so a type of shielding and superconductive materials. it would create glowing lights in the sky as well. i personally believe the seemingly physically maneuvers are because they're not physical objects, and this is why some say they are inter-dimensional, its because they're just balls of plasma being zipped around the sky like a laser pen.    g2fl1m4rnjfav&t=486
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