Unknown Sighting

One night I saw an unusual sight gliding across the sky, moving along quite slowly and it didn’t seem very high. Shining like a beam of light but silent as a cloud, surrounded by a pale blue mist which acted as a shroud. Shaped just like a boomerang but it’s metal shone so bright, even through the misty aura It needed no other light. I followed with my eyes for as far as I could see, but I soon lost sight of it when my vision was blocked by a tree. Later I tried to find out just exactly what I had seen, even enquired at an RAF base but they didn’t seem very keen. I will always have the memory but nothing else to show, what it was I saw that night I guess I’ll never know.