Unknown object seen over RAF base near Belfast.While travelling west out of Belfast on the 16th of March 2008 along the Ligoneill road over Wolf-hill, I, the driver of the car noticed an object in the sky. The hill was a steep uphill climb so I could afford to take a good look while driving uphill. I estimate it was perhaps 50,000 ft because of the type of clouds that it was travelling above. I quickly realised that it was no ordinary aeroplane because the speed it was reavelling and the length and width of the object, which at first appeared to me to be a trail but I soon realised that it was very opaque silver/white, very long, cigar shape. Fortunately I knew the road ahead lay almost exactly in line with the direction the object was travelling and that I would have a clear view of the flatland ahead once I reached the top of the hill, so I asked my passangers to get the camera phones ready. Upon reaching and traversing the crest of the hill I pulled the car over to the side of the road so that my passangers could take a steady shot. By this time the object had travelled very far ahead, I'd estimate around 10 miles in a matter of a few minutes. Aware that the object would soon be passing over a Royal Air Force base and Civil Airport, I observed the object intensly and wondered if the Air Force and Airport controllers were tracking it on Radar. One of my passangers was able to capture two photographs showing the object with reasonable clarity with a wide view of the countryside. Considering that the object had travelled from directly overhead to the horizon by the time we could get cameras ready and the car stopped in a good spot, I think these photos show an accurate indication as to the size, altitude and speed of the object. It was travelling West.There is a three minute interval between the two photographs, simply because my passanger had to delete some old pictures from her phone to make room in the phones memory in order to take the second shot, but this actually helps see the path of the object if you consider the first point of sighting to be almost directly overhead and slightly to the left of both pictures. A couple of minutes after the second picture was taken the object had traversed the entire sky and was gone.