God causes such events to take place in the present world as make the occurrence of Doomsday understandable in advance. An event of this type occurred in the days of the Prophet Muhammad a few years before the Hijrah, when people saw that the moon was ‘cleft in two.’ At that time, the Prophet told the people that just as the moon had broken into pieces, the world would also break into pieces and then a new world would be built.
