Glowing trail behind object, trail dies, becomes semi circle, disappears.Was standing outside with my friend. He noticed the object in question first and said "Look!" I turned and we observed what appeared to be a comet or craft with a large trail behind it which was orange in color heading from east to west. After about 20 seconds, the trail abruptly stopped and we could only see the light of the presumed craft. It continued travel in the same direction. After about another 20 seconds, a large semi circle that was translucent and glowy, hues of green and yellow if I had to use a color to describe it, but it wasn't one distinct color. The craft was at the front, and it was as if there was a circle behind it, but only half. After I'd say about another 30 seconds, the circle disappeared, and then a couple seconds later the light of the craft was gone as well. It was truly bizarre. My mother said she saw the same thing in Long beach, roughly 40 miles to the south east. We could hear what sounded like jet engines throughout most of our viewing of this phenomenon.((NUFORC Note: Atlas V missile launch. PD))