I witnessed an unusual flying object and am not sure what it was. The craft was very high up in the sky, shiny and appeared to have projections, like wings, but it was hard to see. They did not look like normal jet wings, but looked to be shorter and wider than what I've seen before. It seemed to have a roundish shape, not streamlined. Also, there was no vapor trail, and usually here in Colorado we see trails on high flying planes. I don't think it was a smaller plane because it was too high in the sky. The path was unwavering and it was moving at a fast speed. The general direction was towards DIA, but the craft was flying south of the usual flight path in our area.