Very large Meteor or something on fire over San Francisco Bay.At 7:45 PM on Oct 17 2012, I sighted what looked like a very large meteor in the western Sky I sighted it in Union City CA ( the east side of the San Francisco bay). At first I thought it might be a firework but it was too high and too far away. I have seen Meteor showers before in the mountains but this was far bigger It looked like I thought a comet would with a tail that went about two degrees long from where I was standing. It was about 35 degrees up from where I was standing. It was going from my left to right or South to North as I was facing West. It was angling slightly downward then broke up into 3 pieces, all on fire, and began more of a arch going down then they burnt out. This lasted about 3 seconds. It may have been longer but I just saw it as I got out of my car and did not see when it started. I hope it was not a airplane going down into the SF bay.Union city is in a flight path for the Oakland, Hayward and San Francisco Airport, I can always see at least 4 or 5 planes somewhere in the air and would be surprised if one of them didn’t see it.