It might seem churlish to dissect such an enduring image of Christmas as the star of Bethlehem, but a quiet astronomical debate has been bubbling away for decades. Could some real cosmic event have drawn "three wise men" on a journey to find a newborn king?
This debate requires one very big assumption - that the story of the star and the journey is true.
Prof David Hughes, an astronomer from the University of Sheffield, first published a review of the theories on the famous star in the 1970s.
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