Bright, silent light moving across the skyI took my dog out at about 9:15 PST. And happened to look up in the sky, almost directly above me a brilliant, bright, white light was moving across the sky from S.W to N.E. Moving at a constant speed and direction. I'd estimate at an elevation of 30 to 35 thousand feet. And I'd estimate the speed to be around 200-300 MPH. An airplane had past North of the object heading West. I could hear the engines fading away as I noticed the light moving basically in the opposite direction. I kept my attention on the light, noting there was absolutely no sound coming from the object. This was definitely not a shooting star, there was no trail what-so-ever, and moving much too slow. And I'd rule out a satellite, this was closer, more like commercial airlines fly. The night was clear directly over Mammoth Lakes tonight. The moon has already set, or hasn't risen yet. I lost sight of the light approximately two minutes after noticing it, disappearing behind distant clouds N.E. of town.