In one of the most magical stories ever told, a bright star led the wise men from the east to the new Messiah. Now scientists are looking back into the skies of the ancient world to find out if the magi could have witnessed a real astronomical event. 　　Could the star of Bethlehem have been a comet, an alignment of planets or even a supernova? Who were the wise men, and why were they watching the night skies? Could evidence from a clay tablet from Babylon, an ancient manuscript from China, a fresco in the Catacombs of Rome and biblical texts help to finally unravel the greatest astronomical story in history?