Slow moving, silent, bright light travels over Cheyenne WYSingle light came out of the southwest moving northeast. Very bright light, constant and did not radiate much beyond object(?). Unable to see shape. Color: white/pale yellow. Size comparable to the headllights would see on a very low flying helecopter at night if it was coming directly at you. The quality of this light did not change the entire time we watched. Height of this light was about twice that which you would expect to see a helecopter flying over the city (we have air natl guard & their practice flights are usually fairly 'low'). This light traveled silently and slowly. From the time it traveled from 'in front of us', to where we could no longer see it at all, was approx 5-7 minutes.