We saw a low flying light that definitely was not a plane.

We were traveling eastbound on hwy 2 towards Davenport, when we saw a light to the southeast of us. It was headed due east towards the glow of what we presumed is Spokane. The light was as bright as an aircraft coming in for landing but it was missing the blinking green and red lights. The object was also flying lower and faster than when planes are at their cruising altitude. The part that weirded us out was that as we were passed by the object. We did not loose sight of the light until it dipped below the horizon miles and miles to the east of us. Where if it was an airplane we should have lost sight of its front light.