multiple star looking objects traveling in a straight line spaced evenly apart and then disappearing at the same point in the sky.

On Dec. 6th at approx. 18:30 we were driving southbound on Hwy 59. I was looking at the stars and noticed what looked like tower lights at first, but it was unusual. No lights were blinking, and the whole line was moving. I asked my husband to look and see what he thought. I had him pull over and we both got out of the car and watched this straight line of lights that were spaced evenly apart, except the last lights were two lights that were closer together, then one light, then 2 lights closer together again, and then one last light. They were all traveling at the same speed, and when they got to a certain point in the sky, each one disappeared when they hit that same exact point.                                                                                                                                                        It was a very clear night, with no wind, the lights did not float or hover. We have no idea what this could have been, but we have! never seen anything like it. It looked like a line of stars traveling in one straight line then disappearing.  There had to be about 12-15 of the lights traveling from South to North. There was no noise associated with this.
We were looking into the southwest over Prairie Lake by Pelican Rapids, MN. The time frame was approximately 2 minutes in duration.
My husband tried to take a picture and record video but it was too grainy to see anything.
x(disappeared) . .   .   . .   .   .   .   .   .   .   .   . X