very bright light on other side of the mountain, hovering craft with bight light on top and red lights flickering along bottomI was leaving a friends house in Livermore Ca around 1am and I took the corral hollow road so I can intersec with highway 132. While on corral road I noticed a very bright light south of where I was. I thought maybe it was technicians working on mt oso but when I got though the canyon of corral hollow road and onto 580 there it was. It was hugh, just sitting hovering about 500' or so of mt oso. it was a large something with red lights blinking along the bottom of the craft. It also looked like the center of it had walkways or sky walks. I never stopped and as I connected with highway 132 towards modesto I can see it pretty good. I thought it was maybe tower or crain crews but no way. I know it wasnt a helecopter because I have flown on them and it wasnt a plane because it looked nothing like a plane. All I can say is I saw somethig that I have never seen before. There was other cars that had to see the sam thing. It was pretty wild.