On Wednesday evening, I was coming out of my house onto my back porch. As I came down two steps, I looked south beyond our neighbor's house and saw a disk-shaped object. It looked like a big black oval in the failing evening light. I did not see any lights on it. It flew horizontally. I only saw it for about 5 seconds before it disappeared into the tree line. From our house, we can hear when the larger jets land and take off from Columbia Metropolitan Airport. This object made no sound.