A time-exposure image has captured star trails (due to the rotation of the sky) over the Large Binocular Telescope (LBT) on Mt. Graham in Arizona. The north star Polaris is near the center of the rotation (the north celestial pole). The giant observatory combines two side-by-side 8-meter telescopes, make it one of the world's largest telescopes. In resolution the two mirrors are equal to a single 23-meter mirror.