Brilliant bright light moves across the sky in Colorado Springs, CO September 7, 2009.

We were standing in our driveway saying goodbye to our dinner guests when I noticed a brilliant light moving across the sky in the way you would see a satellite move but it was much lower and much larger and brighter than a satellite. The light was longer than it was tall, had no tail and seemed to have a triangle shape or box shape with a point to the bottom.
I pointed it out to my husband and our guests.  No one could say what it was exactly.  It was not flashing or twinkling.  I only saw the white light, my husband saw a small red light on the top, I did not see a red light but the object seemed to have a glow about it almost as if it had a spotlight that it was using.  If it had a spotlight it was not a tight focused beam it was more of a broad subtle beam.
It moved across the sky from west to east.  There was no sound to it.  An airplane caught our attention from the north flying in a southwestern direction.  It had a flashing red light and a whitish, yellowish light and I can’t remember if it flashed.  It was obviously an airplane, you could hear the engine and see the typical flashing red light.
At the same time you could see this other object, it was very different from the airplane, it was lower in the sky and we couldn’t hear it.  Any explanations?