black maybe triangle shape in la grange park il

looked up seen a slow moving black object very low in the sky, not making a sound had maybe 5 or 6 blinking lights of different color, craft could have been triangular shape, it was only 400-500 feet off the ground, maybe a mile or 2 from where i was, the object was moving south/southeast direction. was way to big to be airplane or helicopter, and the fact that it made no noise. planes 1000s of feet in the sky make a sound when pass over head, this thing was moving very slow and was completely silent.
there was no traffic so the area was very quiet could've heard a pin drop, the object just glided across the sky i watched it until it disappeared into the night sky, i didn't have my phone on me so couldn't get a picture or video.. i watched it for maybe 5-6mins not sure what it was, but i do know it wasn't any aircraft that i seen before..