After exiting my jeep wrangler from the apartment parking, there was a field in front of us with a tree ridge. i was with my girlfriend and she had pointed the object out, at first i thought it was a trash sack in the nightsky flying around but there was no wind, it changed direction faster than any human aircraft and swiveled multiple times. it appeared to bob up and down, bank left and right at fast speeds. the apparition was at least 20 or 30ft across but changed shapes multiple times. it seemed to have some sort of pattern of lining i could faintly make out from the complexion. it ended up flying behind the trees after turning multiple times for about 1 minute. i am studying aviation, and i know what is a flock of birds from a ufo. this is something i have never seen before. possible weather testing or camouflaged craft of a sort. no exact shape could be made out of the object. it was not something i could explain. it seemed to be faint at times like it would shoot off in the distance and come back, my iphone camera could pick the object up on my camera cause of how dark it was.