1. was driving back to cheyenne in a work truck. 2 the speed was incredible had to have been more than a 1000hp + and it was really bright just appeared from the dark night sky couldn't miss it. 3 was a comet or shooting star . 4 it was just speeding across the sky then vanished. 5 felt like it it was a shooting star at first but it was going to fast it didnt seem real. it appeared out of the sky for about 5-15 seconds from east to southwest then vanished. i felt like i had seen something that was not man made and didnt seem like a comet or shooting star since it appeared from no where then was gone. made me feel like something eles was out last night and not a human or animal didnt seem real thats why i am reporting was wondering if anybody eles might have seen what i seen. 6 just vanished was gone as quick as it appeared. p.S. i am a man of science and i dont belive in ufos or aliens or ghosts so i am a skeptic, but i know what i seen in the sky last night 3-17-17. and this is not the only time it has happend to me i was with my ex girlfriend 4 or 5 years ago we seen unexplainable objects in the sky. i never reported it but since i seen some crazy shit last night i guess i was compelled to because i was wondering if anybody eles might have seen what me and my coworker seen last night. thank you for your time to whom ever reads my report.