Two (possibly three) extremely bright lights, on huge, low-flying, object. Lights brightened and dimmed, object suddenly disappeared.UFO at 10:30 pm – We live in flight path of commercial aircraft landing at Sacramento Airport. We see many flights landing nightly while sitting in our hot tub. Commercial jets move east to west and make a lot of noise. We rarely see anything moving north to south, (only small aircraft). This was not a small aircraft, as it was huge, low-flying and completely silent. This object/or objects and was many times larger than a commercial aircraft, and it was flying much lower.The object appeared suddenly, as 2 huge bright lights which appeared to be connected by a solid surface. The lights moved in exact unison, with zero noise. There was possibly a third light that was dimmed at the time of the sighting, which would indicate that it could have been a triangle with 3rd light dimmed.Behavior of craft: One light became extremely bright, (brighter than landing lights on aircraft). The second light alternated from medium-bright to dim for a few seconds. Next, the brightest light dimmed and for an instant it seemed as though a third light appeared and then dimmed.The object was huge. We watched it move, north to south for about 2 minutes, and then it completely disappeared while we were watching it. It went from visible to invisible. Poof! … gone!