Brown boomerang shape glided across the sky with no light or sound.

I saw a giant brown boomarang shape in the sky.  No lights, no sound, it just glided across the sky slowly.  It moved like a low cloud across the sky.  
A few minutes later I was looking across the pool in the direction where the ufo had gone, and there were two orbs of light.  
I kept looking until the lights started bouncing, and all the sudden, the ship blasted into space like in the movies.  It left tracers of rainbow neon light behind it.