On page 271 of the Journal of Discourses, Brigham Young stated the following:
“Do you think [the sun] 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 celestialzed. Every planet in its first rude, organic state receives not the glory of God upon it, but it is opaque; but when celestialized, every planet that God brings into existence is a body of light, but not till then.”
Assuming Brigham Young’s thoughts on this matter are correct, it seems then that the Sun was once an inhabited world, and that this earth in its celestial state will have a temperature of 5780 Kelvins (5500 ?Ç¬?C) and be 333,000 larger in mass than it is now.
Actually, what’s even more interesting are the reports that Joseph Smith also taught the moon was inhabited. Or rather it is interesting when compared to scriptures such as the following:
“There is one glory of the sun, and another glory of the moon, and another glory of the stars: for one star differeth from another star in glory.” (1 Cor. 15:41)
“Wherefore, they are bodies terrestrial, and not bodies celestial, and differ in glory as the moon differs from the sun.” (D&C 76:78)