A white puffy cottonball appeared and then a triangle emerged from it. It was totally silent and had a light on each corner.

A white puffy cottonball appeared toward the northeast at about 40 degrees in the sky, and then a triangle emerged from it.  My husband and I were looking for meteors, and we both saw it.  We were on our deck in the back yard.  It was completely silent and moved slowly from northeast to southwest.  I thought it was electromagnetic because all the hairs on my arms stood straight up like with static electricity from a balloon.  It was spooky.  I thought about running in the house, but I couldn't stop watching it.   
It drifted along rather slowly and then stopped, tilted so that the lights appeared to line up, and blinked out.  I saw a red light at each corner of the object, but my husband saw a white light at each corner.  
This was the night that the Pope and the President were in Denver (about 15 miles south of us) at Regis University.  There was no air traffic at all while we were outside, which was unusual.  It was about the length of your thumb held at arm's length.