Among other things, extremely alien-looking aliens would be hard to fit with the idea that God “made man in his own image”.

Furthermore, Jesus Christ’s role as saviour would be confused: would other worlds have their own, tentacled Christ-figures, or would Earth’s Christ be universal?

However, just as the Church eventually made accommodations after Copernicus and Galileo showed that the Earth was not the centre of the universe, and when it belatedly accepted the truth of Darwin’s theory of evolution, Catholic leaders say that alien life can be aligned with the Bible’s teachings.