Hovering bright purpe/orange/green object, 50 feet above vehicle, farm country.Driving down farm country back roads in Washington County, New York around 9pm, no other vehicles on the road, very few houses, several fields, noticed hovering purple/orange/green object in distance, as driving closer, the object dipped 20 feet, and then quickly returned to previous height and hovered very still again. We drove directly underneath it, with no effects to our vehicle. We were able to see above and around the object so it was not in space, it was maybe 50 feet above our vehicle. Took a side road, kept our eyes on it, it remained hovering in the same area, and then a big flash of green light was produced, and it again remained hovering. Eventually lost it behind the tree's, stopped at local gas station, and drove back through and didn't see it again. There was no noise coming from it, for instance not ran by an engine.