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Space impact 'saved Christianity'
By Dr David Whitehouse
BBC News Online science editor

Did a meteor over central Italy in AD 312 change the course of Roman and Christian history?

A team of geologists believes it has found the incoming space rock's impact crater, and dating suggests its formation coincided with the celestial vision said to have converted a future Roman emperor to Christianity.

It was just before a decisive battle for control of Rome and the empire that Constantine saw a blazing light cross the sky and attributed his subsequent victory to divine help from a Christian God.

Constantine went on to consolidate his grip on power and ordered that persecution of Christians cease and their religion receive official status. ...