Bright white sphere witnessed while eastbound on Hwy. 412.On the night of 04/21/2016, at 23:40, I was driving east bound on Hwy. 412. While driving, I witnessed a very bright flash behind my vehicle which was followed by the appearance of a bright white orb in my rear view mirror. The object disappeared from my mirror shortly after appearing there. The object, or one with the same appearance, became visible again to the left of my vehicle 2-3 seconds after disappearing from my mirror. The object moved in a straight line until it was visible in front of me and to the left. The object seemed to pulse once (the light the object was emitting seemed to get brighter and expand momentarily) and then shot forward leaving a bluish white trail that faded quickly. The object flashed again and disappeared. The entire episode lasted approximately 20 seconds.((NUFORC Note: We spoke via telephone with the witness, just minutes after the reported event had occurred, and he seemed to us to be quite sober-minded. Also, he was quite eloquent, and described the event in very object, measured terms. We strongly suspect that he is highly reliable witness. A twenty second long sighting rules out a sighting of a meteor, even an unusually long-duration meteor, we believe. PD))