The Gospel of St. Matthew records a peculiar event: a star marking the place of Jesus' birth. As the story goes, this phenomenon inspired "magi" from the East to journey to find the Christ child. But is there a way to know what the Christmas Star really was? Using various multi-disciplinary threads of information, astrophysicist Grant Mathews has developed a theory to explain what the Christmas Star may have been. He walks us through the research in this re-play of an episode from Season 1 of Notre Dame Stories.