ExoplanetsCourtesy of NASA/JPL
Because faith is such a precious, fragile little thing, you know.
There are a number of reasons people offer as to why life on other planets might disturb us, one of which is the notion that Jesus would have to visit each and every one so he could die horribly all over again. As one theologian recently put it, "It's been argued for a couple of centuries now whether one incarnation of God as Jesus Christ for the entirety of creation is sufficient."
Fortunately, early Christians have already been there and done that.
CosmicAccording to the Apostles, the sacrifice of Jesus is of cosmic significance. It isn't limited to the planet it took place on; it isn't limited at all, in fact. In any way. It touches every person that exists.
The early Christian movement was pretty clear on this. Paul the Apostle, for instance, told Jesus' roman followers that, "the death he died, he died to sin once for all, but the life he lives, he lives to God," (Letter to the Romans 6.10). The Letter to the Hebrews is even plainer: "He came to offer himself only once. And that once is enough for all time. He came at a time when the world is nearing an end. He came to take away all sin by offering himself as a sacrifice," (Hebrews 9.26 ERV).
"Christ died for all," Paul succinctly puts it, "therefore all have died," (Second Letter to the Corinthians 5.14).
"Once for all" -- One death and resurrection, infinitely valuable, is able by itself to put the sins of the universe right -- and what other universes there may be.