On Sunday, April 26, 2009 at around 10:15 a.m. Englewood, Colorado. Sky, slight clouds, otherwise sunny and clear with tempurature about sixty degrees with wind gusts around 15 mph.I was driving at about 25 mph, heading north on Logan from Belview when I noticed a large object in my upper-right prepheral vision. I focused thinking I saw a flying piece of trash. The object was large. I estimate the distance at about 1.5 to 2 miles to the north-east of my position at a height of 1,000 to 1,500 feet, but south of downtown Denver. Clearly not a traditional fixed wing/ or roatary aircraft. The object was solid in build with sharp right angles at its' corners with straight lines along the edges. What I saw was flat, meaning, not 3 dimensional in shape although it might have been. There was nothing surrounding the craft such as ropes, baskets underneath, or a cockpit as would be seen with a blimp. If it was a man-made baloon or blimp, then it was the first I've ever seen of that type. The object was dark in color with a rough texture, a dark dirty-rust brown. There were no lights, just the reflection of sunlight off the flat body. Flight characteristics: Flight path was from the south-east to the north-west. Object followed a straight line and was traveling at a moderate speed for a powered aircraft. My best guess would be around 75 to 125 mph from my distance. A military cargo-jet such as a C-141 would fly at about 130 to 140 mph at a height of 800 to 1,000 feet if it were dropping paratroopers during training. A single engine Cessna would apear to be moving slower, and a comercial passenger jet much faster at that height and distance. If the object was an advertising banner, there would be an aircraft towing the object with some fluttering of the banner, but as stated, this object was the size of a football field and there was no fluttering. The wind should have been pushing the object to the east away from the mountains or at least affecting its' flight movement, but it was flying very straight and smooth against what the wind typically does here. I would estimate the trajectory of the object to be heading in the direction of Golden, Colorado from Broadway and I-25, about where I last saw the object if my range estimates are correct.I've spent 11 years in the military and have seen or been on various types of aircraft to include jumping out of them. I've never seen anything other than man-made flying objects. I want to say that what I saw this morning was a blimp, yet the perfect controlled flight and speed was not blimp-like. There has been so much in the media now-days regarding unidentified flying objects that I felt somewhat accepting of what I witnessed, but the incident was strange enough that I felt I should report what I saw although I'm very skeptical about saying that the object was from outer space.