The discovery of life on other worlds would not at all be inconsistent with Catholic belief, since it reflects the ability of the Creator to establish creatures wherever and whenever he wishes.  Indeed, just as far more species of higher organisms have existed on the Earth in the past than exist today, we might imagine a universe populated with an enormous variety of life forms as an expression of the infinite power of God’s creativity and his desire to give being to many wondrous forms for which there simply is no room in Earth’s ecosystems.

Society of Catholic Scientists