Nothing, really.
A few leaders of the Church of Jesus Christ of Latter Day Saints (commonly known as 'Mormons') have mentioned both historically and more modern that there are other earths with other people on them. This may be where the 'alien' rumor comes from. However, these are not aliens, they are human beings just like you or I, on earths similar to the one we live on. Some might also consider the fact that members of the church believe in heavenly messengers and angels as a belief in aliens. So, yes members of the church believe there is life on other planets, but they do not believe in little green men in silver jumpsuits or consider them 'aliens'. To learn more about the church or to contact church representatives in your local area, visit the link provided below under "Related Links".
Of the 13,824,854 members of the Church of Jesus Christ of Latter-day Saints (the "Mormon" church) worldwide, 7,785,947 live outside the United States. That is, 56% of all baptised Mormons live outside the U.S. Nations with quite a few Mormons are: Canada 179,801 Mormons (1% of Mormons are Canadian, 0.5% of Canadians are Mormon) Samoa 69,224 Mormons (0.5% of Mormons, 39% of Samoans) Tonga 55,173 Mormons (0.5% of Mormons, 53% of Tongans) Mexico 1,197,573 Mormons (8.7% of Mormons, 1% of Mexicans) Guatemala 220,296 Mormons (1.6% of Mormons, 1.6% of Guatemalans) El Salvador 105,501 Mormons (0.8% of Mormons, 2% of El Salvadorians) Hondouras 136,408 Mormons (1% of Mormons, 2% of Hondourans) Brazil 1,102,674 Mormons (8% of Mormons, 0.6% of Brazilians) Chile 561,920 Mormons (4% of Mormons, 3.3% of Chileans) Peru 480,816 Mormons (3.5% of Mormons, 1.7% of Peruvians) Philippines 631,885 Mormons (4.6% of Mormons, 0.7% of all Philippinos) UK 186,082 Mormons (1.3% of Mormons, 0.3% of all UK) Australia 126,767 Mormons (0.9% of Mormons, 0.6% of Australians) New Zealand 100,962 Mormons (0.7% of Mormons, 2.4% of all New Zealanders) To compare, the United States has 6,038,907 Mormons. That's 44% of Mormons and 2% of all Americans. But you can find Mormons in nearly every nation of the World! The "Related Link" below has a great population statistics map related to Mormon Church membership.
Mormons are christians!!!!!
This question is based on an incorrect supposition. Not all Mormons are liars; most Mormons are not liars.
Magic underwear and marrying like 8 women(mormons); Dead Guy that revived and is the son of god(christianity); The spirits of aliens are here on earth and cause all our sorrows(scientology);
many Mormons are minors
Mormons are Christians.
Utah was settled by Mormons.
Trapped by the Mormons was created in 1922.
mormons belief
You will have to ask the Mormons in their category on this site.
Mormons do not have anything against animals.
Mormons in English speaking countries do, but no not all of them do.