Late at night, I saw a very large red light that traveled quickly across the sky and disappeared.

I woke in the night and the light outside seemed bright. We have large West facing windows in the living room, I had fallen asleep on the couch. I looked out the window, just saw the bright yellow moon, which explained the brightness.
 But then, a very large red light appeared in the distance. It was nearly the size of the moon, and yet, far away enough I knew it wasn't over any of the houses in our neighborhood. It would occasionally turn white, and become much smaller, then then flare back into red. For as far away as it had to be, it was moving really quickly. It paused twice and held position.
 I thought perhaps it was a helicopter, but the light was so large, if it was that close I would have heard it. It was traveling north, and eventually moved up until I couldn't see it any longer.