The Book of Moses Chapter 1 
 
33 And worlds without number have I created; and I also created them for mine own purpose; and by the Son I created them, which is mine Only Begotten. 
 
34 And the first man of all men have I called Adam, which is many. 
 
35 But only an account of this earth, and the inhabitants thereof, give I unto you. For behold, there are many worlds that have passed away by the word of my power. And there are many that now stand, and innumerable are they unto man; but all things are numbered unto me, for they are mine and I know them. 
 
 
 
I believe that your interpretation of Moses 1 33 - 35 is not 100% correct, there is no part of this scripture that makes any statements of inhabitants of other worlds, only the creation of them and that Heavenly Father has cause many planets to not only be created but to also pass away.  
 
The key part of this verse though is 35 where I have added emphasis to the statement that only information about our planet is revealed to Moses, so there is no scriptural knowledge of other inhabitants of other planets so the question is scripturally moot since Moses does not make statements to attribute to him. 
 
Since there is no proof scriputrally of other human beings besides those on this planet, there is no scriptural answer. Patience and faith is the key, when we are exalted we shall understand such things. It is best to focus now on how to become more like Christ so we can be exalted and receive such knowledge!  
 
Though from a theoretical and philosophical standpoint I would have to believe that all creations of Heavenly Father throughout the universe were saved by the Atonement, of course I highly doubt there is any Spirit Children living on Heavenly Father living on other planets.  
 
The Book of Abraham points out we went down to Earth (and Earth alone as far as we understand) to experience mortality and grow to become more like Heavenly Father.  
 
Now that doesn't meant it would be impossible, but as at least my amateur understanding of the Standard Works go, there is only human life on this Planet. There is a possibility of human life on other planets but these souls would not be the spirit children of our Heavenly Father, at least as far as I understand.  
 
I hope that my answer helped you understand the Pearl of Great Price better! Thanks for the question.

Your point is taken - I agree that we should focus on trying to become more like Christ. I just get curious sometimes :D 
Also, I guess what you're saying is that we just don't know everything. Again, I agree. 
I would like to point out one thing though: I wasn't only talking about verses 33-35, but also verse 38, where it says 
And as one earth shall pass away, and the heavens thereof even so shall another come; and there is no end to my works, neither to my words. 
 
To me, this seems to indicate that God has created, and will create, other earths. I have no idea whether any of them exist at the same time though. 
 
Thanks for the answer :D

That also goes into verse 35 where the Lord says that many worlds have passed away by his hand as well as were made.  
 
What that means is up to individual interpretation since we do not have a full understanding of what the Lord is saying in these verses.  
 
When taken in context of other scriptures I feel that it is saying that Christ took dead lifeless materials (caused other planets to pass away) and used there materials to create the planets we have know.  
 
This obviously leaves the unanswered question of what was on those planets, whom created those planets, ect, ect.  
 
We are still but infants in the crib of eternal knowledge, as much as I know such things will be revealed and learned in due time, it is very likely that such time will be after I have shaken off this tabernacle and am on the other side of the veil.  
 
That is the greatest blessing of the Plan of Salvation, out learning here is but the tip of the iceberg!  
 
This is a great topic to ponder on, my only caution is that don't let the theology of these things distract from the more important doctrine of the Restored Gospel of Jesus Christ.