www.ewtn.com  <- has been broadcasting for awhile now so aliens within 20-30 ly of earth may have heard of Jesus.  Likewise if reports of UFOs are true then the aliens visiting earth could have heard of him as well.

This issue has been brought up before here on earth because since Christianity started out in the mediterranian areas people who lived before him or after him in areas that had no idea about him would have been effected by the answer to this question.  One specific case is the early attempts to convert Japan, where a lot of people engaged in ancestor worship found it difficult to convert because they were scared that their ancestors may have been in hell.  

According to Bill O'riely (not a church official by any means) and presumably some other catholics Baptism by Desire would come into play here... basically if a person who's never heard of Jesus has realized that he has sinned (through love or reason) and repents for it, that might be enough to grant him a baptism of sorts.

Another thing to consider is that it is plausible that Jesus has appeared in every culture that has sustained intelligent life who's society has gotten to a certain stage. 

WARK!

Thus Spoketh Winterclaw: a blog about a Winterclaw who speaks from time to time.

 

(using Poser Pro 2014 SR3, on 64 bit Win 7, poser units are inches.)