A large blue light steaks acoss the sky, slows downs, and then excelerates.I was lying in my bed at around 11:00 PM on December 17, 2008 watching t.v. I heard an airplane going by outside, as usual, and looked out my looked out the window which is right next to my bed and as I looked I saw the plane I heard, but then a second later, a light dashed quickly across the night sky. It was about the size of what the moon looks like and was turquoise blue. It came out of no where and did what seemed to be a slight decrease in speed before speeding away in a slightly different direction. It went across the horizon from South to North and speed away at an abnormally fast speed. I immediately jumped up from my bed and placed my head against the open window. It was gone though. It had left so fast across the sky. I remember thinking, "well it traveled as fast as an meteorite, but it was just way too big and way too low." I don't know what this phenomena was, but I know what it wasn't and it wasn't a meteorite and it wasn't any man made machine that I am familiar with.