What is an overview of the schools of thought regarding the soteriological status of alien life forms?

What is an overview of the various opinions on whether alien life forms are saved and can go to heaven? I would accept the idea that this has not been substantially discussed as an answer if that is the case. However I have found that there is some opinion on this within the Jehovah's witness community and there is evidence that the Pope would baptise aliens suggesting that the Catholic church must have some view on the matter.