The Bible says a star announced the birth of Jesus. Now geologists say a meteor that landed in Italy in 312 AD may have been seen as a sign from God by the Roman emperor Constantine, causing him to convert to Christianity, saving the religion from almost certain demise.
Constantine saw a blazing light cross the sky just before he went into battle, and he attributed his victory to divine help from the Christian God. Once in power, he stopped the persecution of Christians and gave their religion official status. Without his recognition, what was then a small and oppressed religious movement might have died out.