There could be alien life forms and believing they exist isn't contradictory to having faith in God, the top astronomer at the Vatican said in an interview published Tuesday. In the Vatican newspaper piece, titled The Extraterrestrial Is My Brother," the Rev. Jose Gabriel Funes said the expansiveness of the universe means there could be life on planets other than Earth. "In my opinion this possibility exists," Funes, the director of the Vatican Observatory, told L'Osservatore Romano. "Astronomers believe the universe is made up of 100 billion galaxies, each of which consists of 100 billion stars. Life forms could exist in theory even without oxygen or hydrogen." Funes said that there might even be other intelligent life out there, but believing in its existence doesn't pose a problem for those of the Catholic faith. "It is possible. So far we have no proof. But certainly in a universe so big we can not exclude this hypothesis," he told the paper. "As there is a multiplicity of creatures on earth, so there may be other beings, intelligent, created by God. This does not conflict with our faith, because we cannot put limits on the creative freedom of God." He said human beings could even consider another life form an "extraterrestrial brother" because it, too, would be one of God's creatures. "How can we rule out that life may have developed elsewhere?" Funes said. "Just as we consider earthly creatures as 'a brother,' and 'sister,' why should we not talk about an 'extraterrestrial brother'? It would still be part of creation."