Looking out my window to the west overhead I look up and see what looks to be an aircraft flying towards the Pacific Ocean, I live right next to the seatac airport and as such know the flight patterns of the planes. To expand the last time a plane flied to the west was when the gentleman stole the aircraft 5 years ago from SeaTac.

So I'm viewing this aircraft saying to myself what is he doing, when I get a good look at the aircraft and realize it is not a plane, or anything that I've ever seen for that matter.

The aircraft was a golden orb, ovalish and smooth, and was pulsating a deep gold color. It was about 60 to 80 ft in length and had a spike or rudder-like Fin or metal about 20 or 30 ft in length hanging down.

The aircraft maintained the speed of a civilian aircraft until it was making its way towards the horizon, upon hitting the horizon The aircraft seem to stop in the distance. This is when it got really weird and I feel very small beholding this.

The aircraft started glowing red and burst into red light, like a laser show on the horizon.
It's hard to describe what I saw, but it looked like a small star but bright red, Vermillion in color, like a Megatron or pulsar.

I've always believed in UFOs but had never seen anything to confirm my beliefs until last night.

I am reporting to find out if anybody else saw what I saw last night.

I shouted to the other household residence to come see what I was seeing, but they were too short to see over the house next door so we ran to the back porch and by the time that we were out there the lights and all signs were gone.