UFO Sighting in Arlington, Washington on June 4th 2015 – Very bright moving very slow then faded into not seeing

I always look up at the sky before bed. This time what at first to be a private plane due to the slow speed, was not a plane one light, very bright and no blinking lights, which is always seen on private aircraft. I live across the street from an airport. This light was much brighter and larger then Venus. After watching for about 10 seconds the light went out very slow. The object had not traveled very far from my vision, as it was moving very slow. I have seen so many unknown things in the sky, I just shrugged it as another "thing" I felt that it would be important to at least share the sighting.