What is the propulsion method for the metallic orb?

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A US military drone caught a fast moving metallic orb in the middle east with no visible rotors or exhaust. Its trajectory was straight so it wasn't shot like a cannon ball. What could be its propulsion method?
Here is a video of the metallic orb captured by a US drone. Wondering about the physics of how such an object could fly.

 
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The most likely technology is helium for lift and wind for propulsion. "Metallic orb" sounds a lot like "mylar balloon". But we don't do UFO debunking here so this thread is closed.
 
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