Silent light moving fast and low across the sky.

The craft appeared to be a teardrop shape or possibly two spheres.  One larger toward the front and one smaller directly behind it.  It was moving very fast and heading west/southwest.  It made no noise, and appeared out of nowhere and disappeared just as fast.  It was moving horizontaly over the trees (high over the trees) and was in front of the clouds.  I couldn't tell if it appeared and then disappeared, or whether the lights came on and then went off again (which would hide it from view in the night sky).  It was not a spot light or an airplane.  A spotlight would change in distance as it tracked across the clouds, and the beam would be visible and could be tracked to it's source.  It had no running lights like a plane would, and as I stated earlier, it was silent.  I live near and work at Paine Field, so I see planes come and go all day long, and this was something completely different.  I believe it was one craft, but might possibly have been two, assuming they could travel VERY close together.