Journal of Discourses, Vol. 13, 7/24/1870, page 271

"Who can tell us of the inhabitants of this little planet that shines of an evening, called the moon? When we view its face we may see what is termed 'the man in the moon,' and what some philosophers declare are the shadows of mountains. But these sayings are very vague, and amount to nothing; and when you inquire about the inhabitants of that sphere you find that the most learned are as ignorant in regard to them as the most ignorant of their fellows. So it is with regard to the inhabitants of the sun.

Do you think it is inhabited? I rather think it is. Do you think there is any life there? No question of it; it was not made in vain. It was made to give light to those who dwell upon it, and to other planets; and so will this earth when it is celestialized."

Brigham Young

"Nearly all the great discoveries of men in the last half century have, in one way or another, either directly or indirectly, contributed to prove Joseph Smith to be a Prophet.

As far back as 1837, I know that he said the moon was inhabited by men and women the same as this earth, and that they lived to a greater age than we do—that they live generally to near the age of 1000 years.

He described the men as averaging near six feet in height and dressing quite uniformly in something near the Quaker style.

In my Patriarchal blessing, given by the father of Joseph the Prophet, in Kirtland, 1837, I was told that I should preach the gospel before I was 21 years of age; that I should preach the gospel to the inhabitants upon the islands of the sea, and to the inhabitants of the moon."