Sabbath wrote:
Should have challenged such a question instead of indulging it.
A radio show host who insults his callers instead of answering their questions probably wouldn't have a job for long.
Science fiction and fantasy writers have not considered these kinds of questions to be stupid or pointless to discuss, there are a surprising number of science fiction and fantasy novels that explore these ideas, written both by Christian and non-Christian authors.
I'm sure you're familiar with CS Lewis, he wrote an entire science fiction trilogy on the question of how aliens, if they existed, might fit into the scheme of salvation, a trilogy which even Arthur C Clarke, a science fiction writer himself, and a friend of Lewis, and a militant atheist, once described as 'excellent'.
And then, after his 'space trilogy' was finished, CS Lewis spent an entire decade to writing an elaborate 7 volume series of fantasy novels dedicated to exploring how the Incarnation might have occurred in another universe which was inhabited by intelligent, talking animals.
And if that isn't enough, the same them of how alien civilizations might fit into the plan of salvation, plays a huge role in some of the novels in Orson Scott Card's 'Enderverse' series. And Arthur C Clarke, in his book 'Rendevous With Rama' imagined a fictional future in which there is an entire religion based on the idea that Christ himself was an alien and that he redeemed the entire universe.
Even if it never becomes relevant in the real world (and it probably never will) it is still a question that is worth exploring because it helps to shine a light on our doctrines and to understand them better.
If aliens cannot receive communion, why not? There has to be an answer other than 'because they are aliens.'