Soundless night camo boomerang craft flew slowly over sparks mv

I was standing outside smoking a cigarette and I looked up and saw a soundless night camo (almost invisible) rounded boomerang shaped craft flying about 500-700ft above. As it moved it blocked out the light from the stars. It flew toward the Pevine mt range. It made absolutely no sound. It was about 50ft wide. It was not moving fast. As it moved the night camo shimmered with a very dull grey/pale green hue. No bright lights at all.