We were on our way to Memphis Airport traveling south on I-55 by Delta Refinery. We both noticed lights in the sky through the windshield. As we got closer, I slowed and rolled my window down and stuck my head out to get a better view. It was not moving nor making any sound. I could not believe what I was seeing. Seem to be over twice the size of a 737 just hanging there in the sky. Shaped like a V made of two rectangles, cut at the ends to make a point. My first thought was to pull over and dig the camera out of our luggage, then thought that would be unwise to do on the expressway. The traffic was light, but it was all tractor trailer rigs. I tried adjusting my left rear view mirror, but could not see it even when I looked back. Then, off to my right, some distance away, we saw the same light pattern hanging in the southern sky, too far away see any distinguishable features.To the best of my memory, I would guess the object was 1 to 1.5k feet up, gray in color with white lights along the lower outer edges except for one red light at the back. I would guess that legs of the V to be 30' to 50' square and 200' to 300' long with the span at the back of the V about 150'. There were two protrusions that I could make out clearly on the bottom of the closest leg. One was a cylindrical shaped and the other was like an inverted fender well or a spare tire carrier.I am still befuddled about what it was. I swore to myself I will never travel again without a camera ready. To this day, I want to go back and look, camera ready.