For seven years I have kept this fairly quiet. I was walking my dog on a clear dark night where I live on the north west side of Las Vegas. I happen to look up and I saw a large long massive cigar shaped object. This was "not" a plane and larger than a 747. There was "no" noise. Both ends of the craft appeared to be tapered or blunted. No lights and the altitude of the craft was approximately 4000 to 7000 feet. It wasn't a bright metallic object but a metallic flat color. Possibly a dull greenish color. All of a sudden this object took off slightly to the north or north east at a tremendous speed when it must of realized that I got a fast good look at it. The speed for an object this large was initially moving very slow for its size and weight. I would say less than 90 knots! It was just crusin at the time. When I visited the little Alein Bar near Rachael, Nv., I saw a picture of the the craft on the wall. I then knew I wasn't seeing things.