Home security system sounded alarm. When viewed it showed an a white orb about the size of a grapefruit moving in an intelligent way on top of our vehicle. It reappears again 34 seconds in video then vanishes.This is not a hoax or a joke or an effort to gain fame fortune or any notoriety. I would like an explanation! I have never seen a UFO in my life. The video must be viewed and was captured by the security system not by me and is untouched and not modifies in any way whatsoever.