Enormous object, looked like a rock, miles long

Driving home from work, it was dark , I saw wat at first I thought it was a plane pulling another plane because they were moving together.. but it didn't have " normal " plane lights. It's was just dull white lights .and they were spaced way too far apart.then I realized it was 1 object. And looked like a rock . With dull white lights. Little to no noise. It was massive. I pulled over. . Honestly I was terrified. I didn't try to take a pic, it would not had shown what I was seeing.it was slow moving, and went in the direction of Cheyenne mountain. Other people must have seen this. It was fucking enormous.