Triangular object seen passing over Lycoming Mall in Williamsport, PennsylvaniaI was traveling Southeast on Rt. 180 just before the highway turned to 65 MPH. It was a cobalt blue sky. I was observing the appearing stars and planets when a bright light caught my eye to the left. Of course, I figures it was landing lights on a circling plane. There is a small airport approxamately 4 miles from that location. As I followed the road, i lost sight of the light several times. I hit a long stretch of road. I saw a red light in front, green on one side, and blue on another. The light that seemed to be coming from the belly was no longer visible. I quickly pulled over and rolled down the window. It was now at an altitude of between 2500 and 3500 feet. It creeped across the sky, and made no sound. At that point in time, I was a bit shocked. I felt a nagging urge to drive on. I was disturbed that no one else seemed to notice this, or didn't feel the need to invertigate.