Bright silver object with silver trail traveling at high rate of speed.12 miles NW of Hulett, WY on Friday, Oct. 21, 2011 at approximately 7:30 p.m. I observed a bright silver object traveling from west to east. The object was traveling at a high rate of speed, much faster than jet aircraft. The object was in the distance by several miles but very bright and behind the object was a silver trail. The sky was dark, clear, no clouds or moon and stars were visible. I observed the object for approximately 10 to 12 seconds as it traveled at a high rate of speed heading east and then it simply blinked and was gone. I continued to observe the sky in all directions but never saw the object again.