Being followed by something unknown.......

my brother, sisters, my mother and I were driving on the way back to our house. Well to get to our house you have to drive up a moutain, literally.... I remember looking out the back window of the car and seeing a rounded object in the sky and it appeared to be following us on the base of the moutain. It had multi-colored lights and they all blinked on and off simutaniously(spelling???). I remember my brother also commenting on the event and we were all astonished by what we saw. It was nothing like we had ever seen before. It was moving to slow to be an airplane, and it seemed to just follow us like it wanted to know where we were going, it gave us an excited but eerie sensation. After all we were all younger then! But we all knew that what we saw was ABSOLUTELY NOT AN AIRPLANE. Even to this day that is something that one can NEVER FORGET! I don't really recall the actual month day and year that we had saw this unusual - force - in the sky behind us, but I do recall that it was slightly cold outside and it was dark. slightly cold as in a SEPT. OCT. or NOV. kind of night. and another weird thing that I have also observed not only with the sighting that my siblings and I had witnessed, but as in others that I have read about or heard about, alot or a great percent is near a moutain... WHY? Do they want something from around or inside the moutains, is it better for them to sneek around near moutains, I don't understand but just thinking about it is a little eerie.
Date is approximate.  PD