Among the planets of our Solar System, Uranus alone travels its ancient path lying nearly on its side — a posture so extreme it bends time itself into seasons lasting decades. Scientists have long sought the cause of this 97.77-degree axial tilt, and two leading theories now compete: a primordial collision with an Earth-sized body that struck billions of years ago, and a slower gravitational seduction by a long-vanished moon. Neither explanation has yet closed the case, reminding us that the origins of worlds are rarely as simple as a single dramatic moment.