A light grey craft similar to that of a B2 flying overhead Austin, TX, with no apparent lights and sound.

Standing outside of my 12th-floor patio in my apartment building, I witnessed something approaching from North Austin with no visible lights (it was past midnight). Knowing this did not match commercial flight routes I had seen previously, I watched it fly almost directly overhead me in a south or nearly southeast direction. The first thing that came to mind was a stealth bomber like the B2, but I wouldn't understand why it was flying so low with no lights. I could clearly see the Chevron shape in a light grey tone, but couldn't discern whether it had a full triangle that was black or a darker color. I watched it fly above me for about 30 seconds, where once it got above I removed my headphones and heard no audible noise. At one point, I almost believed the front of the object changed shape from being a straight-angled Chevron, but I couldn't say this for certainty.