A fast moving red orange light flew in a straight line for about 3 or 4 seconds, then dissapearedIt was around 5:00 pm in Vail, Colorado when I saw a bright red circular shaped light moving for about 4 seconds through the sky. I could recognize the exact shape since it was all light. The color was a red with just a little orange. I was with my brother the moment I saw it and rapidly told him to look, but the craft had already dissapeared. It moved at a speed which was never as slow as a plane, it was also moving at a faster speed than a jet. I could say its speed was around half the speed of a shooting star. It moved in a straight line from left to right (from my point of view). It didn't make any sound.