The apostle Matthew records that the birth of Jesus was accompanied by an extraordinary celestial event: a star that led the magi (the "wise men") to Jesus. This star "went before them, till it came and stood over where the young child was" (Matthew 2:9). What was this star? And how did it lead the magi to the Lord? There have been many speculations.
The star mentioned in Matthew is not necessarily what we normally think of as a star. That is, it was not necessarily an enormous mass of hydrogen and helium gas powered by nuclear fusion. The Greek word translated star is aster (αστηρ), which is where we get the word astronomy. In the biblical conception of the word, a star is any luminous point of light in our night sky. This would certainly include our modern definition of a star, but it would also include the planets, supernovae, comets, or anything else that resembles a point of light. But which of these explanations best describes the Christmas star?
A supernova (an exploding star) fits the popular Christmas card conception of the star. When a star in our galaxy explodes, it shines very brightly for several months. These beautiful events are quite rare and outshine all the other stars in the galaxy. It seems fitting that such a spectacular event would announce the birth of the King of kings — the God-man who would outshine all others. However, a supernova does not fit the biblical text. The Christmas star must not have been so obvious, for it went unnoticed by Israel’s King Herod (Matthew 2:7). He had to ask the magi when the star had appeared, but everyone would have seen a bright supernova.
[Read the rest of the article at Answers in Genesis.]