I Saw a Ufo

years ago I was visiting a friend in the hospital on a dark clear starry night. When I left the hospital i went out to the car in the parking lot and waiting for the rest of my friends to come out. I don't know why but I looked up and notice a strange metallic looking circle straight above me - it was giving off light and I was going to dismiss it until it suddenly went straight up until it disappeared. it only took a few seconds to disappear so it was travelling at a tremendous speed. i tried to make excuses for it - but was never able to do so. One of my friends looked up and saw it too when he came out of the hospital and was wondering what I was staring at.