September 30th 2016 around 840pm in arvada colorado i noticed 7-9 glowing round white cream see thru objects flying in a boomerang formation appear off of the eastern horizon flying west in straight line all the lights were the same size and in almost perfect boomerang formation.No noise from them and goin fast..I've seen ducks,drones,chinese lanterns and planes fly out from dia this was none of them.I was looking east and could see something faint coming towards me i watched them fly over my head about 3,000 feet in the sky and head west took about 5 seconds and they were already in the mountains