Orange light split in two and then melded back into one light before vanishingMy wife and I were driving West on I-10 near Houghton Rd. exit when we noticed an array of twinkling lights hovering just SW of Tucson, Arizona. It was a clear night and we counted at least six white lights that were flickering at what seemed to be a much faster rate than ordinary commercial or military aircraft. My first thought was that maybe Tucson Airport (or possibly Davis-Monthan Air Force base) was experiencing some kind of incident on a runway causing air traffic to backup and circle in a holding pattern. This was not the case. Soon it was clear that these lights were not "flying" but hovering in place. Not too long after the shimmering lights had appeared, a larger, bright orange light materialized beneath them. Then things got a bit stranger. The large orange light appeared to split into two distinct orbs, each retaining the same shape and color of the original. In a matter of seconds the two lights merged together again into a single orb before vanishing along with the twinkling background lights. At this point my wife was more concerned about my staying on the road because I was starting to swerve in and out of my lane. The best that I could tell is that at least some of the twinkling lights flew into the larger orange light. I couldn't believe what we were seeing. As I exited Houghton Rd. we parked to see if the activity was still continuing. We saw nothing. As I started driving North on Houghton I looked into my rear-view mirror and saw the orange light appearing once again. It did a repeat performance- split in two and then melded back into one light before vanishing. Then that was it.