Board Thread:Naruto: The Last Discussion/@comment-25343176-20150204032611/@comment-25632268-20150205182532

If Uchihas, at least Madara, known about God Tree, Kaguya, Hagoromo etc. then there is no reason that Toneri shouldn't know as well. I think Hamura explained and maybe wrote down whole story and the reason they live on the Moon and not on Earth. It is an assumption, movie doesn't really covers this, and it is also not explained why Toneri is the last living clan member (yes, there was war between Main and Branch house, but in Hinata's vision it looks like Branch simply annihilated their enemies without casualties on their side).

There is also no answer to the question why Naruto and company can breathe while being on Moon's surface, we can only assume that Hamura and Otsutsuki Clan somehow made it possible.