Yes the annunaki, a very interesting antient culture, I have been reading that the Americans are conducting secret experiments with aliens in a few location underground, for the purpose of developing the perfect humanoid vessel that can survive radiation exposure in outer space for a long time, or be able to survive under different gravity conditions.
I think that has been the main goal by aliens for tens of thousands of years, as no species can survive being in outer space for a long time, or under different gravities for very long, unless a purpose built environment has been built.
Its a big issue for space travel.
