My brother and I were driving home in the early morning, and entering the town of Portsmouth, Iowa. We were about half a mile from the town when I noticed a green light, similar to an 'orb', in the sky. It seemed to be far away, but within a mile of the earth's ground. After a few seconds of hovering, it started moving upwards, and took a sharp turn towards the ground where it made a curved path towards the ground. But not curved towards the earth like an asteroid/comet/meteor would make when being pulled in by gravity. The object made a curved motion going the opposite direction of gravity. After a few seconds the object completely disappeared. There were no trees or hills that it could have disappeared over, so it was unmistakenably just 'disappearing into thin air.'This isn't the first time we have seen something paranormal in this area, but nothing to these measures.Both of us were very emotional over the object, and could barely speak about what we saw. We both agreed that this is something we can't speak to anyone about, except maybe a professional, as most would dismiss this as being 'crazy', or something along those lines.