I saw a luminous object which I can only desribe as a UFO...

I was aproximately 9 years old at the time.  I lived below a place called Peavine Mountain.  The day was beautiful, not a cloud in the sky.  As I was playing outside in the yard, I noticed an object flying along a range of hills.  As I watched it, I noticed that it traveling extremely slow.  I thought to myself that this could not be a plane because it was moving too slow, and it could not be a helicopter because it made no noise.  As it got closer, I noticed that it was shaped like a disc.  What really made it seem so strange is that this saucer in the sky was luminous, it glowed like a light bulb in the sky.  I sat there in my yard and couldn't take my eyes off of this object.  It approached a big hill and disappeared behind it.  I looked to the other side of the hill to see if it was going to appear on the other side.  All of sudden, I saw a huge silver streak go across the sky, like this thing took off at a tremendous rate of speed.  This was unlike anything I have ever witnessed before or since…
Date is approximate.  PD