Low flying black cylinder without any lights or noiseAt approximately 0430 in the morning I was driving eastbound along an access road of a decommissioned government facility. I approached a four way intersection and glanced up through my windshield and saw what looked like a black in color cylinder shaped aircraft without wings gliding through the sky with no running lights on it. The movement of the object through the sky caught my attention and by the time I got out of my vehicle and attempted to get a better view, the object had passed out of my field of view in a southeast direction. The craft appeared to be under a thousand feet in altitude and the glow from the street lights must have been reflecting off of it so I could just make out the shape, color and apparent speed. The speed of the craft was relatively slow and it appeared to be gliding along and there wasn’t the sound of an aircraft’s engine at any time. By the last seen direction of the craft I would guess it would have passed between Rattlesnake Mountain and the town of West Richland, WA. The Hanford Site is located approximately 30 miles northwest of Richland, a town in the southeastern portion of Washington State. I’m a full time employee for the primary contractor on the Hanford Site.