Object over North Platte NebraskaAt approximately 21:55 on 10-10-2011 I was about 2 miles south of North Platte on hwy 83 headed north. I was on a section of the hwy that had a view of direct north with no obstructions. As I approached the highest elevation of that section of the highway I saw a bright light that lasted for about 3 to 4 seconds. I was on a direct north route and the object I saw was in the upper right corner of the windshield. I was unaware if the object was there for some time,I believe I saw it only as it came into view of my windshield. I would say it was about 20 degrees to my right traveling a direct south to north route.The object had no tail so I believe it was not a comet that entered the atmosphere. The best way I can describe it in size and shape would be the same as the planet Jupiter. I am very familiar with that planet as I see it the morning from my back porch (I use Google Sky Map on my phone) It was round and it moved very quickly. It was very bright and it was a white light with no color at all. I see planes and helicopter in this area all the time and it was defiantly neither.The altitude I cannot determine as there were no other objects to reference in the night sky. It seemed to be going due north but not descending. At one point it was gone I am not sure where it went as I had to get my eyes back on the road. As I looked again it was gone. The weather conditions were clear and cloudless.I am not claiming to have seen a "UFO" or "spaceship" what I saw was a large round bright object in the sky moving at a very high rate of speed.