12/10/2016, Delta, Co, 7 orange/pink fireballs 6 to 7 minutes, seen by 2 peopleDecember 10, 2016 9:15pm We live five miles East of Delta, Co. On 12/10/2016, I sited 2 orange/pink spheres/fireballs, the were hovering and a slight motion left to right. Seconds later another one appeared . The third one appeared low on the horizon, than gained altitude to join the other two. They made a triangle formation. I went in the house got my husband out of bed and by the time we got back outside a fourth one had appeared and they made a diamond formation. They hovered for a few seconds, than one by one at a high rate of speed moved west over Delta and disappeared into the clouds. As the fourth one disappeared two more appeared at the original spot, hovering, than a third one appeared much closer to us, The last one appeared to be within a forth of a mile from us as it was a lot larger than the others, the three of them made a triangle formation and than again one by one moved west. There was on sound. This took about 6 to 7 minutes. There was a cloud bank to the south of us, and t! hey appeared below the cloud band and in front of it. They gained altitude, as they move West over Delta they then flew into the cloud bank and disappeared. Only the last one that appeared must have turned as it took a different shape, fireball in front and a slight arch and a smaller fireball at the end. Temperature 37 degrees and no wind. We live in the country and there is no road noise, so when there is noise it is easy to distinguish what it is.