5 of us were waiting for an iridium flare to appear on the No.Eastern sky,at approximately 18:43 hrs., when one of my friends got the rest of us to observe a triangular shaped craft,that suddenly appeared from the East and flew very low across to the south west. Tha craft seemed to rotate,as it flew across the sky, and was almost transparent in nature. It seemed as if you could see right through it, but definitely had a shape and lights around it. From the way it was moving, it seemed to leave some sort of trail,it almost reminded me of when you see a ship re-entering the atmosphere and there are vapor streams from friction or something. We all saw it zoom across for about 10 seconds or so and then disappeared. It did not make any noise whatsover. We were all at awe of this insident. This happened in Santa Cruz, California, Thanksgiving evening. Did anyone else see it?